[clang] [clang] Return larger CXX records in memory (PR #120670)

[Pranav Kant via cfe-commits]

================
@@ -2067,6 +2081,10 @@ void X86_64ABIInfo::classify(QualType Ty, uint64_t 
OffsetBase, Class &Lo,
         classify(I.getType(), Offset, FieldLo, FieldHi, isNamedArg);
         Lo = merge(Lo, FieldLo);
         Hi = merge(Hi, FieldHi);
+        if (returnCXXRecordGreaterThan128InMem(
+                Size, getContext().getTypeSize(I.getType()),
+                getNativeVectorSizeForAVXABI(AVXLevel)))
+          Lo = Memory;
----------------
pranavk wrote:

This seemed like the most appropriate location for such a check as I only want 
to do it for CXXRecords (`if dyn_cast<CXXRecordDecl>` ...) which is already 
being checked here.

https://github.com/llvm/llvm-project/pull/120670
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