toolchain-utils: Script to merge profdata and upload to gs bucket

This script downloads profdata from tryjob artifacts on different
architectures, merges them into one llvm.profdata, make a tarball and
upload it to gs bucket, so that ChromeOS toolchain can use it for PGO
optimization.

BUG=chromium:937903
TEST=None

Change-Id: I96c31a66eaf0306c2f6d9b84541280c08edc4e7d
Reviewed-on: https://chromium-review.googlesource.com/1565195
Commit-Ready: Zhizhou Yang <zhizhouy@google.com>
Tested-by: Zhizhou Yang <zhizhouy@google.com>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
1 file changed