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

libbb/ptr_to_globals.c

@@ -0,0 +1,11 @@
+/* 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. It is declared as const ptr in libbb.h,
+ * but here we make it live in R/W memory */
+struct globals;
+struct globals *ptr_to_globals;