*: add optimization barrier to all "G trick" locations

shell/ash_ptr_hack.c

@@ -0,0 +1,16 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2008 by Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+/* We cheat here. They are declared as const ptr in ash.c,
+ * but here we make them live in R/W memory */
+struct globals_misc;
+struct globals_memstack;
+struct globals_var;
+
+struct globals_misc     *ash_ptr_to_globals_misc;
+struct globals_memstack *ash_ptr_to_globals_memstack;
+struct globals_var      *ash_ptr_to_globals_var;