[polymorphic-builtin] Disable experimental builtin test when optimization is enabled for now.

I am going to loop back around later and I want to unblock the package bots.

Author: gottesmm

test/Interpreter/polymorphic_builtins.swift

@@ -17,6 +17,10 @@
 
 // REQUIRES: executable_test
 
+// TODO: Re-enable this when optimization is enabled.
+//
+// REQUIRES: swift_test_mode_optimize_none
+
 import Swift
 import StdlibUnittest
 import mysimd