[clang] [llvm] [ARM] Fix musttail calls (PR #109943)

[Eli Friedman via llvm-commits]

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@@ -5112,7 +5112,7 @@ 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:

https://github.com/llvm/llvm-project/pull/104795#discussion_r1722204520

https://github.com/llvm/llvm-project/pull/109943