[llvm] [DirectX] legalize memset (PR #136244)

[Justin Bogner via llvm-commits]

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@@ -239,6 +247,72 @@ downcastI64toI32InsertExtractElements(Instruction &I,
   }
 }
 
+void emitMemsetExpansion(IRBuilder<> &Builder, Value *Dst, Value *Val,
+                         ConstantInt *SizeCI,
+                         DenseMap<Value *, Value *> &ReplacedValues) {
+  LLVMContext &Ctx = Builder.getContext();
+  [[maybe_unused]] DataLayout DL =
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bogner wrote:

Should probably be `const DataLayout &` - we don't usually copy these.

https://github.com/llvm/llvm-project/pull/136244