[llvm] [SPIRV] Add support for pointers to functions with aggregate args/returns as global variables / constant initialisers (PR #169595)

[Juan Manuel Martinez Caamaño via llvm-commits]

================
@@ -469,6 +471,23 @@ bool SPIRVPrepareFunctions::substituteIntrinsicCalls(Function *F) {
   return Changed;
 }
 
+static void addFunctionTypeMutation(
+    NamedMDNode *NMD,
+    SmallVector<std::pair<int, Type *>> ChangedTys, StringRef Name) {
----------------
jmmartinez wrote:

What's the interest of passing `ChangedTys` by doing an `std::move` in here vs a `const&` ? (maybe the explanation is in the follow-up PR ?)

https://github.com/llvm/llvm-project/pull/169595