[clang] [clang] Lower _BitInt(129+) to a different type in LLVM IR (PR #91364)

[John McCall via cfe-commits]

================
@@ -1533,9 +1533,17 @@ void CodeGenFunction::EmitReturnStmt(const ReturnStmt &S) {
     Builder.CreateStore(Result.getScalarVal(), ReturnValue);
   } else {
     switch (getEvaluationKind(RV->getType())) {
-    case TEK_Scalar:
-      Builder.CreateStore(EmitScalarExpr(RV), ReturnValue);
-      break;
+    case TEK_Scalar: {
+      llvm::Value *Ret = EmitScalarExpr(RV);
+      // EmitStoreOfScalar could be used here, but it extends bool which for
+      // some targets is returned as i1 zeroext.
----------------
rjmccall wrote:

I don't think so; we'd need an actual flag in `CodeGenFunction`.  Maybe we could recreate it without that by looking at the value.

https://github.com/llvm/llvm-project/pull/91364