[clang] [llvm] [CodeGen][i386] Move -mregparm storage earlier and fix Runtime calls (PR #89707)

[Kees Cook via cfe-commits]

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@@ -4781,6 +4782,7 @@ CodeGenModule::CreateRuntimeFunction(llvm::FunctionType *FTy, StringRef Name,
         }
       }
       setDSOLocal(F);
+      markRegisterParameterAttributes(F);
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kees wrote:

This seems like a large proposed change; is it worth it for this corner case? I think I would prefer to fix this as I have it now.

https://github.com/llvm/llvm-project/pull/89707