Patch merged into coreboot/master: Provide a gcc-safe zero pointer

the following patch was just integrated into master:
commit ff8076d75ace8da247b927f7de37f3ed5081b55e
Author: Patrick Georgi 
Date:   Wed Jan 27 08:18:16 2016 +0100

Provide a gcc-safe zero pointer

zeroptr is a linker object pointing at 0 that can be used to thwart
    GCC's (and other compilers') "dereferencing NULL is undefined"
    optimization strategy when it gets in the way.

Change-Id: I6aa6f28283281ebae73d6349811e290bf1b99483
    Signed-off-by: Patrick Georgi 
    Reviewed-on: https://review.coreboot.org/12294
    Tested-by: Raptor Engineering Automated Test Stand 
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/12294 for details.

-gerrit