[clang-tools-extra] [clang] [C23] Fix crash with _BitInt running clang-tidy (PR #65889)

[Aaron Ballman via cfe-commits]

================
@@ -1333,7 +1333,15 @@ void StmtProfiler::VisitPredefinedExpr(const PredefinedExpr *S) {
 void StmtProfiler::VisitIntegerLiteral(const IntegerLiteral *S) {
   VisitExpr(S);
   S->getValue().Profile(ID);
-  ID.AddInteger(S->getType()->castAs<BuiltinType>()->getKind());
+
+  int FoldingSetID = 0;
+
+  if (S->getType()->isBitIntType())
+    FoldingSetID = S->getValue().getSExtValue();
+  else
+    FoldingSetID = S->getType()->castAs<BuiltinType>()->getKind();
+
+  ID.AddInteger(FoldingSetID);
----------------
AaronBallman wrote:

Each `Type` subclass has a `Profile()` function that determines type identity. This is how we ensure that a `_BitInt(2)` and a `_BitInt(3)` can both be represented by `BitIntType` but not be the same type for things like redeclarations or overloading.

https://github.com/llvm/llvm-project/pull/65889