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

[Eli Friedman via cfe-commits]

================
@@ -1144,11 +1167,13 @@ bool MicrosoftCXXABI::classifyReturnType(CGFunctionInfo 
&FI) const {
   if (!RD)
     return false;
 
-  bool isTrivialForABI = RD->canPassInRegisters() &&
-                         isTrivialForMSVC(RD, FI.getReturnType(), CGM);
-
   // MSVC always returns structs indirectly from C++ instance methods.
-  bool isIndirectReturn = !isTrivialForABI || FI.isInstanceMethod();
+  bool isIndirectReturn = FI.isInstanceMethod();
----------------
efriedma-quic wrote:

I'd like to keep ABI changes as simple as possible; please separate.

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