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This makes LLD faster, especially when performing ThinLTO.
Reduces link time of chrome.dll with 34% in official builds
with ThinLTO enabled.

It also makes regular (non-goma) builds 6% faster.

Bug: 1111798
Change-Id: I12870d5b14bf559b333260347dbb93c7e4fe8a5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398685
Commit-Queue: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Auto-Submit: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807644}