[llvm] [DirectX] Remove intrinsic definitions with no use (PR #133459)

[Farzon Lotfi via llvm-commits]

================
@@ -18,15 +18,15 @@
 using namespace llvm;
 
 static bool finalizeLinkage(Module &M) {
-  SmallPtrSet<Function *, 8> Funcs;
+  SmallVector<Function *> Funcs;
----------------
farzonl wrote:

just a cleanup since I'm touching this file.

https://github.com/llvm/llvm-project/pull/133459