diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index c31980a47f39b..81f2753a4edd8 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -653,9 +653,6 @@ option(LLVM_USE_OPROFILE
 option(LLVM_EXTERNALIZE_DEBUGINFO
   "Generate dSYM files and strip executables and libraries (Darwin Only)" OFF)
 
-option(LLVM_EXPERIMENTAL_DEBUGINFO_ITERATORS
-  "Add extra Booleans to ilist_iterators to communicate facts for debug-info" ON)
-
 set(LLVM_CODESIGNING_IDENTITY "" CACHE STRING
   "Sign executables and dylibs with the given identity or skip if empty (Darwin Only)")
 
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 0699a8586fcc7..486df22c2c1bb 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -140,10 +140,6 @@ if(LLVM_ENABLE_EXPENSIVE_CHECKS)
   endif()
 endif()
 
-if(LLVM_EXPERIMENTAL_DEBUGINFO_ITERATORS)
-  add_compile_definitions(EXPERIMENTAL_DEBUGINFO_ITERATORS)
-endif()
-
 if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS)
   add_compile_definitions(STRICT_FIXED_SIZE_VECTORS)
 endif()
diff --git a/llvm/include/llvm/ADT/ilist_iterator.h b/llvm/include/llvm/ADT/ilist_iterator.h
index 9047b9b73959e..2393c4d2c403c 100644
--- a/llvm/include/llvm/ADT/ilist_iterator.h
+++ b/llvm/include/llvm/ADT/ilist_iterator.h
@@ -202,17 +202,12 @@ class ilist_iterator_w_bits : ilist_detail::SpecificNodeAccess<OptionsT> {
 
   node_pointer NodePtr = nullptr;
 
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
-  // (Default: Off) Allow extra position-information flags to be stored
-  // in iterators, in aid of removing debug-info intrinsics from LLVM.
-
   /// Is this position intended to contain any debug-info immediately before
   /// the position?
   mutable bool HeadInclusiveBit = false;
   /// Is this position intended to contain any debug-info immediately after
   /// the position?
   mutable bool TailInclusiveBit = false;
-#endif
 
 public:
   /// Create from an ilist_node.
@@ -231,10 +226,8 @@ class ilist_iterator_w_bits : ilist_detail::SpecificNodeAccess<OptionsT> {
       const ilist_iterator_w_bits<OptionsT, IsReverse, RHSIsConst> &RHS,
       std::enable_if_t<IsConst || !RHSIsConst, void *> = nullptr)
       : NodePtr(RHS.NodePtr) {
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
     HeadInclusiveBit = RHS.HeadInclusiveBit;
     TailInclusiveBit = RHS.TailInclusiveBit;
-#endif
   }
 
   // This is templated so that we can allow assigning to a const iterator from
@@ -243,10 +236,8 @@ class ilist_iterator_w_bits : ilist_detail::SpecificNodeAccess<OptionsT> {
   std::enable_if_t<IsConst || !RHSIsConst, ilist_iterator_w_bits &>
   operator=(const ilist_iterator_w_bits<OptionsT, IsReverse, RHSIsConst> &RHS) {
     NodePtr = RHS.NodePtr;
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
     HeadInclusiveBit = RHS.HeadInclusiveBit;
     TailInclusiveBit = RHS.TailInclusiveBit;
-#endif
     return *this;
   }
 
@@ -280,10 +271,8 @@ class ilist_iterator_w_bits : ilist_detail::SpecificNodeAccess<OptionsT> {
           const_cast<typename ilist_iterator_w_bits<OptionsT, IsReverse,
                                                     false>::node_reference>(
               *NodePtr));
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
       New.HeadInclusiveBit = HeadInclusiveBit;
       New.TailInclusiveBit = TailInclusiveBit;
-#endif
       return New;
     }
     return ilist_iterator_w_bits<OptionsT, IsReverse, false>();
@@ -309,18 +298,14 @@ class ilist_iterator_w_bits : ilist_detail::SpecificNodeAccess<OptionsT> {
   // Increment and decrement operators...
   ilist_iterator_w_bits &operator--() {
     NodePtr = IsReverse ? NodePtr->getNext() : NodePtr->getPrev();
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
     HeadInclusiveBit = false;
     TailInclusiveBit = false;
-#endif
     return *this;
   }
   ilist_iterator_w_bits &operator++() {
     NodePtr = IsReverse ? NodePtr->getPrev() : NodePtr->getNext();
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
     HeadInclusiveBit = false;
     TailInclusiveBit = false;
-#endif
     return *this;
   }
   ilist_iterator_w_bits operator--(int) {
@@ -340,18 +325,10 @@ class ilist_iterator_w_bits : ilist_detail::SpecificNodeAccess<OptionsT> {
   /// Check for end.  Only valid if ilist_sentinel_tracking<true>.
   bool isEnd() const { return NodePtr ? NodePtr->isSentinel() : false; }
 
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
   bool getHeadBit() const { return HeadInclusiveBit; }
   bool getTailBit() const { return TailInclusiveBit; }
   void setHeadBit(bool SetBit) const { HeadInclusiveBit = SetBit; }
   void setTailBit(bool SetBit) const { TailInclusiveBit = SetBit; }
-#else
-  // Store and return no information if we're not using this feature.
-  bool getHeadBit() const { return false; }
-  bool getTailBit() const { return false; }
-  void setHeadBit(bool SetBit) const { (void)SetBit; }
-  void setTailBit(bool SetBit) const { (void)SetBit; }
-#endif
 };
 
 template <typename From> struct simplify_type;
diff --git a/llvm/tools/llc/llc.cpp b/llvm/tools/llc/llc.cpp
index 3e2567c441df5..b292f70ba89de 100644
--- a/llvm/tools/llc/llc.cpp
+++ b/llvm/tools/llc/llc.cpp
@@ -365,15 +365,11 @@ int main(int argc, char **argv) {
   }
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
-  // new debug-info format, if it's built in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // new debug-info format.
   if (TryUseNewDbgInfoFormat) {
-    // If LLVM was built with support for this, turn the new debug-info format
-    // on.
+    // Turn the new debug-info format on.
     UseNewDbgInfoFormat = true;
   }
-#endif
-  (void)TryUseNewDbgInfoFormat;
 
   if (TimeTrace)
     timeTraceProfilerInitialize(TimeTraceGranularity, argv[0]);
diff --git a/llvm/tools/llvm-link/llvm-link.cpp b/llvm/tools/llvm-link/llvm-link.cpp
index d50e0678f4610..e6c219a8cd7ec 100644
--- a/llvm/tools/llvm-link/llvm-link.cpp
+++ b/llvm/tools/llvm-link/llvm-link.cpp
@@ -473,15 +473,11 @@ int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
-  // new debug-info format, if it's built in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // new debug-info format.
   if (TryUseNewDbgInfoFormat) {
-    // If LLVM was built with support for this, turn the new debug-info format
-    // on.
+    // Turn the new debug-info format on.
     UseNewDbgInfoFormat = true;
   }
-#endif
-  (void)TryUseNewDbgInfoFormat;
 
   LLVMContext Context;
   Context.setDiagnosticHandler(std::make_unique<LLVMLinkDiagnosticHandler>(),
diff --git a/llvm/tools/llvm-lto/llvm-lto.cpp b/llvm/tools/llvm-lto/llvm-lto.cpp
index f27281438282b..7943d6952b828 100644
--- a/llvm/tools/llvm-lto/llvm-lto.cpp
+++ b/llvm/tools/llvm-lto/llvm-lto.cpp
@@ -945,15 +945,11 @@ int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
-  // new debug-info format, if it's built in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // new debug-info format.
   if (TryUseNewDbgInfoFormat) {
-    // If LLVM was built with support for this, turn the new debug-info format
-    // on.
+    // Turn the new debug-info format on.
     UseNewDbgInfoFormat = true;
   }
-#endif
-  (void)TryUseNewDbgInfoFormat;
 
   if (OptLevel < '0' || OptLevel > '3')
     error("optimization level must be between 0 and 3");
diff --git a/llvm/tools/llvm-lto2/llvm-lto2.cpp b/llvm/tools/llvm-lto2/llvm-lto2.cpp
index c212374a0eccb..d5de4f6b1a277 100644
--- a/llvm/tools/llvm-lto2/llvm-lto2.cpp
+++ b/llvm/tools/llvm-lto2/llvm-lto2.cpp
@@ -230,15 +230,11 @@ static int run(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv, "Resolution-based LTO test harness");
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
-  // new debug-info format, if it's built in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // new debug-info format.
   if (TryUseNewDbgInfoFormat) {
-    // If LLVM was built with support for this, turn the new debug-info format
-    // on.
+    // Turn the new debug-info format on.
     UseNewDbgInfoFormat = true;
   }
-#endif
-  (void)TryUseNewDbgInfoFormat;
 
   // FIXME: Workaround PR30396 which means that a symbol can appear
   // more than once if it is defined in module-level assembly and
diff --git a/llvm/tools/llvm-reduce/llvm-reduce.cpp b/llvm/tools/llvm-reduce/llvm-reduce.cpp
index 71ce0ca5ab6ab..f913771487afe 100644
--- a/llvm/tools/llvm-reduce/llvm-reduce.cpp
+++ b/llvm/tools/llvm-reduce/llvm-reduce.cpp
@@ -151,15 +151,11 @@ int main(int Argc, char **Argv) {
   cl::ParseCommandLineOptions(Argc, Argv, "LLVM automatic testcase reducer.\n");
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
-  // new debug-info format, if it's built in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // new debug-info format.
   if (TryUseNewDbgInfoFormat) {
-    // If LLVM was built with support for this, turn the new debug-info format
-    // on.
+    // Turn the new debug-info format on.
     UseNewDbgInfoFormat = true;
   }
-#endif
-  (void)TryUseNewDbgInfoFormat;
 
   if (Argc == 1) {
     cl::PrintHelpMessage();
diff --git a/llvm/tools/opt/optdriver.cpp b/llvm/tools/opt/optdriver.cpp
index 3f66bfc9f0176..85f52941a85b4 100644
--- a/llvm/tools/opt/optdriver.cpp
+++ b/llvm/tools/opt/optdriver.cpp
@@ -462,15 +462,11 @@ extern "C" int optMain(
       argc, argv, "llvm .bc -> .bc modular optimizer and analysis printer\n");
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
-  // new debug-info format, if it's built in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // new debug-info format.
   if (TryUseNewDbgInfoFormat) {
-    // If LLVM was built with support for this, turn the new debug-info format
-    // on.
+    // Turn the new debug-info format on.
     UseNewDbgInfoFormat = true;
   }
-#endif
-  (void)TryUseNewDbgInfoFormat;
 
   LLVMContext Context;
 
diff --git a/llvm/unittests/ADT/IListIteratorBitsTest.cpp b/llvm/unittests/ADT/IListIteratorBitsTest.cpp
index 167b30a5e3085..8ae73b1ed5f78 100644
--- a/llvm/unittests/ADT/IListIteratorBitsTest.cpp
+++ b/llvm/unittests/ADT/IListIteratorBitsTest.cpp
@@ -55,10 +55,8 @@ TEST(IListIteratorBitsTest, ConsAndAssignment) {
 
   simple_ilist<Node, ilist_iterator_bits<true>>::iterator I, I2;
 
-// Two sets of tests: if we've compiled in the iterator bits, then check that
-// HeadInclusiveBit and TailInclusiveBit are preserved on assignment and copy
-// construction, but not on other operations.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
+  // Check that HeadInclusiveBit and TailInclusiveBit are preserved on
+  // assignment and copy construction, but not on other operations.
   I = L.begin();
   EXPECT_FALSE(I.getHeadBit());
   EXPECT_FALSE(I.getTailBit());
@@ -85,18 +83,6 @@ TEST(IListIteratorBitsTest, ConsAndAssignment) {
   simple_ilist<Node, ilist_iterator_bits<true>>::iterator I3(I);
   EXPECT_TRUE(I3.getHeadBit());
   EXPECT_TRUE(I3.getTailBit());
-#else
-  // The calls should be available, but shouldn't actually store information.
-  I = L.begin();
-  EXPECT_FALSE(I.getHeadBit());
-  EXPECT_FALSE(I.getTailBit());
-  I.setHeadBit(true);
-  I.setTailBit(true);
-  EXPECT_FALSE(I.getHeadBit());
-  EXPECT_FALSE(I.getTailBit());
-  // Suppress warnings as we don't test with this variable.
-  (void)I2;
-#endif
 }
 
 class dummy {
diff --git a/llvm/unittests/IR/BasicBlockDbgInfoTest.cpp b/llvm/unittests/IR/BasicBlockDbgInfoTest.cpp
index ef2b288d859a7..53b191c688384 100644
--- a/llvm/unittests/IR/BasicBlockDbgInfoTest.cpp
+++ b/llvm/unittests/IR/BasicBlockDbgInfoTest.cpp
@@ -27,11 +27,6 @@ using namespace llvm;
 
 extern cl::opt<bool> UseNewDbgInfoFormat;
 
-// None of these tests are meaningful or do anything if we do not have the
-// experimental "head" bit compiled into ilist_iterator (aka
-// ilist_iterator_w_bits), thus there's no point compiling these tests in.
-#ifdef EXPERIMENTAL_DEBUGINFO_ITERATORS
-
 static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
   SMDiagnostic Err;
   std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
@@ -1535,4 +1530,3 @@ TEST(BasicBlockDbgInfoTest, DbgMoveToEnd) {
 }
 
 } // End anonymous namespace.
-#endif // EXPERIMENTAL_DEBUGINFO_ITERATORS