[clang] [HLSL] Forward arguments in BuiltinTypeMethodBuilder::callBuiltin. NFC (PR #117789)

[Justin Bogner via cfe-commits]

================
@@ -564,9 +585,9 @@ struct BuiltinTypeMethodBuilder {
                                       OK_Ordinary);
   }
 
-  BuiltinTypeMethodBuilder &
-  callBuiltin(StringRef BuiltinName, ArrayRef<Expr *> CallParms,
-              bool AddResourceHandleAsFirstArg = true) {
+  template <typename... Ts>
+  BuiltinTypeMethodBuilder &callBuiltin(StringRef BuiltinName, Ts... ArgSpecs) {
+    SmallVector<Expr *> Args{convertPlaceholder(std::forward<Ts>(ArgSpecs))...};
----------------
bogner wrote:

This raises a good point though - I'll change this to just use `std::array` here since we know the exact size at compile time.

https://github.com/llvm/llvm-project/pull/117789