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

[Mariya Podchishchaeva via cfe-commits]

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@@ -5348,6 +5348,13 @@ Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
     return llvm::UndefValue::get(ArgTy);
   }
 
+  if (const auto *BIT = Ty->getAs<BitIntType>()) {
+    if (BIT->getNumBits() > 128) {
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Fznamznon wrote:

Called `VisitVAArgExpr` here.

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