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

[Mariya Podchishchaeva via cfe-commits]

================
@@ -761,6 +761,10 @@ bool ConstStructBuilder::Build(const InitListExpr *ILE, 
bool AllowOverwrite) {
       if (Field->hasAttr<NoUniqueAddressAttr>())
         AllowOverwrite = true;
     } else {
+      llvm::Type *LoadType = CGM.getTypes().convertTypeForLoadStore(
----------------
Fznamznon wrote:

In `ConstantEmitter::emitForMemory` we now split constant into individual bytes 
if the target type is a long `_BitInt`. However after an integer constant 
expected by `AppendBitField`, so this just folds individual bytes back to an 
integer. 

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