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

[Eli Friedman via cfe-commits]

================
@@ -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) {
----------------
efriedma-quic wrote:

This seems a little fragile; specifically for _BitInt, we assume the pointer is 
wrong and the return type is right, but in other cases, we assume the pointer 
is right and we need to do some sort of conversion.

Can we fix the interface of EmitVAArg so we can just EmitLoadOfScalar() here?

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