[clang] [clang][CodeGen] Fix MSVC ABI for classes with non static data members of reference type (PR #90547)

[Max Winkler via cfe-commits]

================
@@ -1131,13 +1132,18 @@ static bool isTrivialForMSVC(const CXXRecordDecl *RD, 
QualType Ty,
     return false;
   if (RD->hasNonTrivialCopyAssignment())
     return false;
+  if (RD->needsImplicitCopyAssignment() && !RD->hasSimpleCopyAssignment())
----------------
MaxEW707 wrote:

I didn't find a `defaultedCopyAssignmentIsDeleted()` method on `CXXRecordDecl` 
however `hasSimpleCopyAssignment()` does what we want here when combined with 
`needsImplicitCopyAssignment()`.

Let me know if there is a better check to capture implicitly declared but 
deleted copy assignment operators on the record.

https://github.com/llvm/llvm-project/pull/90547
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