[clang] Refactor Builtins.def to be a tablegen file (#68324)

This makes the builtins list quite a bit more verbose, but IMO this is a
huge win in terms of readability.

clang/include/clang/AST/Expr.h

@@ -6410,7 +6410,7 @@ class AtomicExpr : public Expr {
   enum AtomicOp {
 #define BUILTIN(ID, TYPE, ATTRS)
 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID,
-#include "clang/Basic/Builtins.def"
+#include "clang/Basic/Builtins.inc"
     // Avoid trailing comma
     BI_First = 0
   };
@@ -6476,7 +6476,7 @@ class AtomicExpr : public Expr {
 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS)                                        \
   case AO##ID:                                                                 \
     return #ID;
-#include "clang/Basic/Builtins.def"
+#include "clang/Basic/Builtins.inc"
     }
     llvm_unreachable("not an atomic operator?");
   }
@@ -6505,8 +6505,8 @@ class AtomicExpr : public Expr {
   }
 
   bool isOpenCL() const {
-    return getOp() >= AO__opencl_atomic_init &&
-           getOp() <= AO__opencl_atomic_fetch_max;
+    return getOp() >= AO__opencl_atomic_compare_exchange_strong &&
+           getOp() <= AO__opencl_atomic_store;
   }
 
   SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
@@ -6531,11 +6531,14 @@ class AtomicExpr : public Expr {
   /// \return empty atomic scope model if the atomic op code does not have
   ///   scope operand.
   static std::unique_ptr<AtomicScopeModel> getScopeModel(AtomicOp Op) {
-    if (Op >= AO__opencl_atomic_load && Op <= AO__opencl_atomic_fetch_max)
+    // FIXME: Allow grouping of builtins to be able to only check >= and <=
+    if (Op >= AO__opencl_atomic_compare_exchange_strong &&
+        Op <= AO__opencl_atomic_store && Op != AO__opencl_atomic_init)
       return AtomicScopeModel::create(AtomicScopeModelKind::OpenCL);
-    else if (Op >= AO__hip_atomic_load && Op <= AO__hip_atomic_fetch_max)
+    if (Op >= AO__hip_atomic_compare_exchange_strong &&
+        Op <= AO__hip_atomic_store)
       return AtomicScopeModel::create(AtomicScopeModelKind::HIP);
-    else if (Op >= AO__scoped_atomic_load && Op <= AO__scoped_atomic_fetch_max)
+    if (Op >= AO__scoped_atomic_add_fetch && Op <= AO__scoped_atomic_xor_fetch)
       return AtomicScopeModel::create(AtomicScopeModelKind::Generic);
     return AtomicScopeModel::create(AtomicScopeModelKind::None);
   }