[JITLink][x86-64] Rename BranchPCRel32ToPtrJumpStub(Relaxable -> Bypa…

…ssable).

ELF allows for branch optimizations other than bypass, so rename this edge kind
to avoid any confusion.

llvm/include/llvm/ExecutionEngine/JITLink/x86_64.h

@@ -132,7 +132,7 @@ enum EdgeKind_x86_64 : Edge::Kind {
   /// This edge kind has the same fixup expression as BranchPCRel32, but further
   /// identifies the call/branch as being to a pointer jump stub. For edges of
   /// this kind the jump stub should not be bypassed (use
-  /// BranchPCRel32ToPtrJumpStubRelaxable for that), but the pointer location
+  /// BranchPCRel32ToPtrJumpStubBypassable for that), but the pointer location
   /// target may be recorded to allow manipulation at runtime.
   ///
   /// Fixup expression:
@@ -148,7 +148,8 @@ enum EdgeKind_x86_64 : Edge::Kind {
   ///
   /// The edge kind has the same fixup expression as BranchPCRel32ToPtrJumpStub,
   /// but identifies the call/branch as being to a pointer jump stub that may be
-  /// bypassed if the ultimate target is within range of the fixup location.
+  /// bypassed with a direct jump to the ultimate target if the ultimate target
+  /// is within range of the fixup location.
   ///
   /// Fixup expression:
   ///   Fixup <- Target - Fixup + Addend - 4: int32
@@ -157,7 +158,7 @@ enum EdgeKind_x86_64 : Edge::Kind {
   ///   - The result of the fixup expression must fit into an int32, otherwise
   ///     an out-of-range error will be returned.
   ///
-  BranchPCRel32ToPtrJumpStubRelaxable,
+  BranchPCRel32ToPtrJumpStubBypassable,
 
   /// A GOT entry getter/constructor, transformed to Delta32 pointing at the GOT
   /// entry for the original target.
@@ -338,7 +339,7 @@ inline Error applyFixup(LinkGraph &G, Block &B, const Edge &E,
 
   case BranchPCRel32:
   case BranchPCRel32ToPtrJumpStub:
-  case BranchPCRel32ToPtrJumpStubRelaxable:
+  case BranchPCRel32ToPtrJumpStubBypassable:
   case PCRel32GOTLoadRelaxable:
   case PCRel32TLVPLoadRelaxable: {
     int64_t Value =

llvm/lib/ExecutionEngine/JITLink/ELF_x86_64.cpp

@@ -107,10 +107,9 @@ class PerGraphGOTAndPLTStubsBuilder_ELF_x86_64
   void fixPLTEdge(Edge &E, Symbol &Stub) {
     assert(E.getKind() == x86_64::BranchPCRel32 && "Not a Branch32 edge?");
 
-    // Set the edge kind to Branch32ToStub. We will use this to check for stub
-    // optimization opportunities in the optimize ELF_x86_64_GOTAndStubs pass
-    // below.
-    E.setKind(x86_64::BranchPCRel32ToPtrJumpStubRelaxable);
+    // Set the edge kind to Branch32ToPtrJumpStubRelaxable to enable it to be
+    // optimized when the target is in-range.
+    E.setKind(x86_64::BranchPCRel32ToPtrJumpStubBypassable);
     E.setTarget(Stub);
   }
 
@@ -191,7 +190,7 @@ static Error optimizeELF_x86_64_GOTAndStubs(LinkGraph &G) {
             dbgs() << "\n";
           });
         }
-      } else if (E.getKind() == x86_64::BranchPCRel32ToPtrJumpStubRelaxable) {
+      } else if (E.getKind() == x86_64::BranchPCRel32ToPtrJumpStubBypassable) {
         auto &StubBlock = E.getTarget().getBlock();
         assert(
             StubBlock.getSize() ==

llvm/lib/ExecutionEngine/JITLink/MachO_x86_64.cpp

@@ -466,10 +466,10 @@ class PerGraphGOTAndPLTStubsBuilder_MachO_x86_64
     assert(E.getAddend() == 0 &&
            "BranchPCRel32 edge has unexpected addend value");
 
-    // Set the edge kind to BranchPCRel32ToPtrJumpStubRelaxable. We will use
+    // Set the edge kind to BranchPCRel32ToPtrJumpStubBypassable. We will use
     // this to check for stub optimization opportunities in the
     // optimizeMachO_x86_64_GOTAndStubs pass below.
-    E.setKind(x86_64::BranchPCRel32ToPtrJumpStubRelaxable);
+    E.setKind(x86_64::BranchPCRel32ToPtrJumpStubBypassable);
     E.setTarget(Stub);
   }
 
@@ -535,7 +535,7 @@ static Error optimizeMachO_x86_64_GOTAndStubs(LinkGraph &G) {
             dbgs() << "\n";
           });
         }
-      } else if (E.getKind() == x86_64::BranchPCRel32ToPtrJumpStubRelaxable) {
+      } else if (E.getKind() == x86_64::BranchPCRel32ToPtrJumpStubBypassable) {
         auto &StubBlock = E.getTarget().getBlock();
         assert(StubBlock.getSize() == sizeof(x86_64::PointerJumpStubContent) &&
                "Stub block should be stub sized");

llvm/lib/ExecutionEngine/JITLink/x86_64.cpp

@@ -38,8 +38,8 @@ const char *getEdgeKindName(Edge::Kind K) {
     return "BranchPCRel32";
   case BranchPCRel32ToPtrJumpStub:
     return "BranchPCRel32ToPtrJumpStub";
-  case BranchPCRel32ToPtrJumpStubRelaxable:
-    return "BranchPCRel32ToPtrJumpStubRelaxable";
+  case BranchPCRel32ToPtrJumpStubBypassable:
+    return "BranchPCRel32ToPtrJumpStubBypassable";
   case RequestGOTAndTransformToDelta32:
     return "RequestGOTAndTransformToDelta32";
   case RequestGOTAndTransformToDelta64: