kbuild: set -fconserve-stack option for gcc 4.5

The upcomming gcc 4.5 has a new -fconserve-stack option that tells the
inliner to take stack frame size in account. Set it if the compiler
supports it.

Signed-off-by: Andi Kleen <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>

Makefile

···
 # revert to pre-gcc-4.4 behaviour of .eh_frame
 KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
 
+# conserve stack if available
+KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
+
 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 # But warn user when we do so
 warn-assign = \