https://github.com/tbaederr created 
https://github.com/llvm/llvm-project/pull/106826

The comment already explains that this is only true for _some_ builtin 
functions. This also brings the time it takes me to run the 
builtin-functions.cpp test locally from 50s down to 47s.

>From e38266cd0fa28e9c314b3cedb108d0a3ee3dcaa0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbae...@redhat.com>
Date: Sat, 31 Aug 2024 07:20:26 +0200
Subject: [PATCH] [clang][bytecode][NFC] Check for custom typechecking in call
 cleanup

The comment already explains that this is only true for _some_ builtin
functions. This also brings the time it takes me to run the
builtin-functions.cpp test locally from 50s down to 47s.
---
 clang/lib/AST/ByteCode/Interp.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/AST/ByteCode/Interp.cpp 
b/clang/lib/AST/ByteCode/Interp.cpp
index 42012767c22332..c4f76a3cc03aae 100644
--- a/clang/lib/AST/ByteCode/Interp.cpp
+++ b/clang/lib/AST/ByteCode/Interp.cpp
@@ -226,7 +226,8 @@ void cleanupAfterFunctionCall(InterpState &S, CodePtr OpPC) 
{
 
   // Some builtin functions require us to only look at the call site, since
   // the classified parameter types do not match.
-  if (CurFunc->isBuiltin()) {
+  if (unsigned BID = CurFunc->getBuiltinID();
+      BID && S.getASTContext().BuiltinInfo.hasCustomTypechecking(BID)) {
     const auto *CE =
         cast<CallExpr>(S.Current->Caller->getExpr(S.Current->getRetPC()));
     for (int32_t I = CE->getNumArgs() - 1; I >= 0; --I) {

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