Patch merged into coreboot/master: 55cdc16 Provide a way to compile some files with -O0 option

the following patch was just integrated into master:
commit 55cdc160bbe1827e8ab1a2370ab1ebb0162e9768
Author: Vadim Bendebury 
Date:   Tue Apr 22 17:06:43 2014 -0700

Provide a way to compile some files with -O0 option

When preparing an image for source level debugging, it is convenient
    to be able to compile some modules with -O0, which makes it much
    easier to follow the execution flow.

This patch allows to do it by defining GDB_DEBUG=1 in the environment
    before invoking make. Adding this feature as a common config flag is
    problematic, because we don't want to compile the entire image with
    -O0.

Signed-off-by: Vadim Bendebury 
    Reviewed-on: https://chromium-review.googlesource.com/196359
    (cherry picked from commit dde4928c045d12e502cb109015a710cd9fdf2a04)

Changed from CFLAGS to CFLAGS_common.

Change-Id: Ie0be653509509eeb64ea3a7229f54c0c812840a9
    Signed-off-by: Isaac Christensen 
    Reviewed-on: http://review.coreboot.org/7005
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/7005 for details.

-gerrit