enable full optimizations in test

doesn't seem to be a need to skip destroy hoisting
anymore.

Author: kavon

test/stdlib/move_function.swift

@@ -1,8 +1,4 @@
-// RUN: %target-run-stdlib-swift(-Xllvm -sil-disable-pass=DestroyHoisting -Xfrontend -enable-experimental-move-only)
-//
-// NOTE ON ABOVE: I am disabling destroy hoisting on this test since we are
-// going to move it out of the mandatory pipeline eventually and it causes the
-// test to fail only when optimizations are enabled.
+// RUN: %target-run-stdlib-swift(-O)
 
 // REQUIRES: executable_test