profile.bashrc: Add support for frozen GCC

Add support to use a frozen 4.9.2 GCC for packages
that can't use latest GCC. Invoking cros_use_frozen_gcc
in ebuilds should make them use this frozen GCC.

BUG=chromium:1095110
TEST=verified by calling $(which $CC) in ebuild

Change-Id: Iedda3e39925f360b04c3c9b26b33707b8d1a223f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2618720
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed