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

[Eli Friedman via cfe-commits]

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

This really shouldn't work this way: we should go through 
CodeGenModule::SetLLVMFunctionAttributes to get all the correct attributes for 
a function.  Unfortunately, that's a bit complicated in this context because 
you need to construct a CGFunctionInfo, and none of the callers currently do 
that.  Which might be more work than you really want...  CC @JonPsson1 
@jdoerfert @jhuber6

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