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

[via cfe-commits]

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@@ -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);
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cor3ntin wrote:

I think that can lead to different expression having the same id.
Did you consider using `S->getBitWidthValue()` that gives you the number of bits in the bitfield + a boolean that tells you whether it is a bitfield?

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