Patch merged into coreboot/master: arm64: xcompile: Add support for A53 erratum 843419

the following patch was just integrated into master:
commit 4bfa29e94788df12c5845adeb8d5fb915db89541
Author: Julius Werner 
Date:   Thu Aug 20 14:36:34 2015 -0700

arm64: xcompile: Add support for A53 erratum 843419

This patch adds support to enable a linker workaround to a hardware
    erratum on some early Cortex-A53 revisions. Since the linker option was
    added very recently, we use xcompile to test whether the toolchain
    supports it first. It is also guarded by a Kconfig since only a few
    ARM64 SoCs will need this and it incurs a performance penalty.

BRANCH=none
    BUG=none
    TEST=Turned it on or off for Smaug and confirmed that it (dis)appeared
    in verbose make output accordingly.

Change-Id: I01c9642d3cf489134645f0db6f79f1c788ddb00d
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 57128785760c4dfa32d6e6d764756443a9323cb7
    Original-Change-Id: Ia5dd124f484e38460d75fb864304e7e8b18d16b7
    Original-Signed-off-by: Julius Werner 
    Original-Reviewed-on: https://chromium-review.googlesource.com/294745
    Original-Reviewed-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/11403
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer 
    Reviewed-by: Julius Werner

See http://review.coreboot.org/11403 for details.

-gerrit