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

[Mariya Podchishchaeva via cfe-commits]

================
@@ -1886,6 +1896,29 @@ llvm::Constant 
*ConstantEmitter::emitForMemory(CodeGenModule &CGM,
     return Res;
   }
 
+  if (destType->isBitIntType()) {
+    if (CGM.getTypes().typeRequiresSplitIntoByteArray(destType, C->getType())) 
{
+      // Long _BitInt has array of bytes as in-memory type.
+      // So, split constant into individual bytes.
+      ConstantAggregateBuilder Builder(CGM);
+      llvm::Type *DesiredTy = CGM.getTypes().ConvertTypeForMem(destType);
+      llvm::Type *LoadStoreTy =
----------------
Fznamznon wrote:

Using `convertTypeForLoadStore` is aligned with other similar places and IMO 
seems more generalized approach.

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