[clang] [llvm] [WIP] Expand variadic functions in IR (PR #89007)

[Matt Arsenault via cfe-commits]

================
@@ -154,11 +154,20 @@ llvm::Value 
*CodeGen::emitRoundPointerUpToAlignment(CodeGenFunction &CGF,
                                                     llvm::Value *Ptr,
                                                     CharUnits Align) {
   // OverflowArgArea = (OverflowArgArea + Align - 1) & -Align;
+  Ptr = CGF.Builder.CreateAddrSpaceCast(Ptr, CGF.AllocaInt8PtrTy,
+                                        Ptr->getName() + ".addrcast");
----------------
arsenm wrote:

This isn't the right place for it, I would expect this function to preserve 
whatever address space was passed in 

https://github.com/llvm/llvm-project/pull/89007
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