[llvm] [InferAddressSpaces] Fix constant replace to avoid modifying other functions (PR #70611)

[Wenju He via llvm-commits]

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@@ -334,6 +335,15 @@ template<> struct simplify_type<User::const_op_iterator> {
   }
 };
 
+template <> struct GraphTraits<User *> {
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wenju-he wrote:

see my other comment for why df is needed. Adding GraphTraits is a convenient way to iterate over user using df_begin/df_end.

https://github.com/llvm/llvm-project/pull/70611