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A follow-up to https://chromium-review.googlesource.com/c/chromium/src/+/2467360

android-official is no longer timing out with that change (
https://ci.chromium.org/p/chromium/builders/ci/android-official/2242
https://ci.chromium.org/p/chromium/builders/ci/android-official/2243
), but builds are still much slower than before.

Try doubling number of tasks and see what that does.

I suppose the thinlto cache means that concurrent links save some
time for each other -- even if the cpus are oversubscribed, every
running link can do work that the other links do.

The CrOS ebuild set link parallelism to 1, so explicitly do this
if goma lto is on, so that we don't increase the load on goma from
lto tasks.

Bug: 1132930,1137812
Change-Id: If2b451fa3dc69f7ecde05e581ddb46addc901118
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468740
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816759}