[clang] [clang][CodeGen] `sret` args should always point to the `alloca` AS, so use that (PR #114062)

[Matt Arsenault via cfe-commits]

================
@@ -1350,7 +1350,7 @@ bool ItaniumCXXABI::classifyReturnType(CGFunctionInfo 
&FI) const {
   // If C++ prohibits us from making a copy, return by address.
   if (!RD->canPassInRegisters()) {
     auto Align = CGM.getContext().getTypeAlignInChars(FI.getReturnType());
-    FI.getReturnInfo() = ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
+    FI.getReturnInfo() = ABIArgInfo::getIndirect(Align, 0, /*ByVal=*/false);
----------------
arsenm wrote:

I'm assuming these should default to DL.getAllocaAddrSpace but I guess that's a 
separate change that calls for new test coverage 

https://github.com/llvm/llvm-project/pull/114062
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