[clang] Fix #104794: Fixed sret bugs with `clang::musttail` on 32 bit targets (PR #104795)

[Eli Friedman via cfe-commits]

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@@ -5085,7 +5085,7 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
   RawAddress SRetAlloca = RawAddress::invalid();
   llvm::Value *UnusedReturnSizePtr = nullptr;
   if (RetAI.isIndirect() || RetAI.isInAlloca() || RetAI.isCoerceAndExpand()) {
-    if (IsVirtualFunctionPointerThunk && RetAI.isIndirect()) {
+    if ((IsVirtualFunctionPointerThunk && RetAI.isIndirect()) || IsMustTail) {
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efriedma-quic wrote:

Do any of the tests cover the case of `RetAI.isInAlloca()` or `RetAI.isCoerceAndExpand()`?

https://github.com/llvm/llvm-project/pull/104795