[coreboot] Patch merged into coreboot/master: 4715d6b Poison the stack to uncover programming errors

the following patch was just integrated into master:
commit 4715d6b4706fb78e9073295b878b69a6cf37ab6f
Author: Ronald G. Minnich 
Date:   Thu Jul 12 11:21:51 2012 -0700

Poison the stack to uncover programming errors

Code can easily make the mistake of using uninitialized
    values or, in assembly, mistakenly dereferencing stack pointers
    when an address is desired.

Set the stack to a non-zero value which is also (by testing)
    a pointer which will crash coreboot if used. This poisoning
    has uncovered at least one bug.

Change-Id: I4affb9a14b96611e8bf83cb82636e47913025a5d
    Signed-off-by: Ronald G. Minnich

Build-Tested: build bot (Jenkins) at Thu Jul 12 21:15:45 2012, giving +1
Reviewed-By: Sven Schnelle  at Thu Jul 12 21:22:58 2012, giving +2
See http://review.coreboot.org/1221 for details.

-gerrit