[GCC] Unify GCC between ChromeOS and Android.

This CL contains all the changes for the ChromeOS GCC compiler to
unify it with the Android GCC compiler.

BUG=None
TEST=Built ChromeOS images for daisy, peach_pit, oak, peppy and
x86_alex, both in my own chroot and with trybots, with this
CL.  Loaded test images onto Chromebooks, booted chromebooks,
ran bvt-cq, bvt-inline, BootPerfServer, regression, security and
graphics autotests on the chromebooks.  Also ran various telemetry
performance tests on the chromebooks.   Also did various Android-side
testing.

Change-Id: Ie3b37c708978d844200b4586d7d9bf67a613f5d5
Reviewed-on: https://chromium-review.googlesource.com/327221
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Trybot-Ready: Caroline Tice <cmtice@chromium.org>
Commit-Queue: Caroline Tice <cmtice@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
75 files changed