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lld doesn't support /debug:fastlink, and so we used to assert when
trying to use those two together.

However, as we're planning to switch over to lld by default, we don't
want to break the builds of those who have specified is_win_fastlink
manually. Instead, ignore the flag when linking with lld, and eventually
it will be phased out altogether.

Bug: 792131
Change-Id: I83ff749254d4dbc55aedbfc6e87702e8e8a06a23
Reviewed-on: https://chromium-review.googlesource.com/966225Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543714}