features/llvm: Use llvm-objcopy as default objcopy

Setting the OBJCOPY portage variable to llvm-objcopy.
Uppreving gcc for CQ testing.

BUG=chromium:1147661
TEST=CQ

Disallow-Recycled-Builds: test-failures
Change-Id: Idc107189d93b69d9e66e97a3fabe3ccde2596bf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2531376
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
2 files changed