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Now that we do PGO, linux already used lld in pgo builds, so this
doesn't really change much on linux (lld is now used for building
the instrumented compiler too, which isn't that big a change).

No intended behavior change.

Bug: 958852
Change-Id: Ia19d47fd5d3e366b513570041e3b3a16d05a8b93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636672Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671535}