[clang] [llvm] [ARM] musttail fixes (PR #102896)

[Eli Friedman via cfe-commits]

================
@@ -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 || IsMustTail) && RetAI.isIndirect()) {
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efriedma-quic wrote:

Yes, please separate this.

https://github.com/llvm/llvm-project/pull/102896
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