Add compiler-rt package to arm board prebuilts.

compiler-rt package is required to run clang with
profiler/sanitizer options on arm boards.
To avoid breaking builders, compiler-rt will not be installed
with --usepkg option till chromiumos-sdk builder uploads new prebuilts.

BUG=chromium:604877
TEST="./setup_board --board=arm-generic --nousepkg" builds compiler-rt
TEST="./setup_board --board=arm-generic" does not  build compiler-rt

Change-Id: I22669c41065586a81f8ab04b88f591f2df73e876
Reviewed-on: https://chromium-review.googlesource.com/451977
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
1 file changed