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

diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index c98a74f..827ea21 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -309,7 +309,7 @@
 #define MBRbuffer       (G.MBRbuffer)
 #define ptes            (G.ptes)
 #define INIT_G() do { \
-	PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 	sector_size = DEFAULT_SECTOR_SIZE; \
 	sector_offset = 1; \
 	g_partitions = 4; \
diff --git a/util-linux/fsck_minix.c b/util-linux/fsck_minix.c
index deb82f7..62e4f08 100644
--- a/util-linux/fsck_minix.c
+++ b/util-linux/fsck_minix.c
@@ -190,7 +190,7 @@
 #define check_file_blk     (G.check_file_blk     )
 #define current_name       (G.current_name       )
 #define INIT_G() do { \
-	PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 	dirsize = 16; \
 	namelen = 14; \
 	current_name[0] = '/'; \
diff --git a/util-linux/mkfs_minix.c b/util-linux/mkfs_minix.c
index 118b95e..a784b72 100644
--- a/util-linux/mkfs_minix.c
+++ b/util-linux/mkfs_minix.c
@@ -122,7 +122,7 @@
 };
 #define G (*ptr_to_globals)
 #define INIT_G() do { \
-	PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 } while (0)
 
 static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n)
diff --git a/util-linux/more.c b/util-linux/more.c
index eeeea50..2d55359 100644
--- a/util-linux/more.c
+++ b/util-linux/more.c
@@ -28,9 +28,7 @@
 	struct termios new_settings;
 };
 #define G (*(struct globals*)bb_common_bufsiz1)
-//#define G (*ptr_to_globals)
 #define INIT_G() ((void)0)
-//#define INIT_G() PTR_TO_GLOBALS = xzalloc(sizeof(G))
 #define initial_settings (G.initial_settings)
 #define new_settings     (G.new_settings    )
 #define cin_fileno       (G.cin_fileno      )
diff --git a/util-linux/script.c b/util-linux/script.c
index fda726e..e6dbb1a 100644
--- a/util-linux/script.c
+++ b/util-linux/script.c
@@ -25,7 +25,7 @@
 #define tt        (G.tt       )
 #define fname     (G.fname    )
 #define INIT_G() do { \
-	PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 	fname = "typescript"; \
 } while (0)