[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 +472,23 @@ bool SPIRVPrepareFunctions::substituteIntrinsicCalls(Function *F) {
   return Changed;
 }
 
+static void
+addFunctionTypeMutation(NamedMDNode *NMD,
+                        SmallVector<std::pair<int, Type *>> ChangedTys,
+                        StringRef Name) {
+
+  LLVMContext &Ctx = NMD->getParent()->getContext();
+  Type *I32Ty = IntegerType::getInt32Ty(Ctx);
+
+  SmallVector<Metadata *> MDArgs;
+  MDArgs.push_back(MDString::get(Ctx, Name));
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jmmartinez wrote:

Just an idea: Could we use `ValueAsMetadata` in here instead of the name?

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