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Allows R8 and lld to run concurrently, saving on build times.

Bug: 1078460
Change-Id: I9ee978800b649634461c49ced4a26ca5015869cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2259292
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782274}