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This reverts commit 7ba450fd.

Reason for revert: lld-link currently warns if the orderfile
references non-existing functions, without implementing the flag
to disable that warning. Since our orderfiles are usually somewhat
out of date, lld-link currently always warns. Reland once
https://llvm.org/PR36657 is fixed and rolled in.

Original change's description:
> win: Use order files with lld as well.
> 
> Bug: 792131, 728324
> Change-Id: I3b2ebe4a2073b6a03193dac5c497dbd3c53fc06d
> Reviewed-on: https://chromium-review.googlesource.com/955726
> Reviewed-by: Reid Kleckner <rnk@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#541874}

TBR=thakis@chromium.org,rnk@chromium.org

Change-Id: Ic9c6b7e94b99559c88a61fb22df253becf6853e9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 792131, 728324
Reviewed-on: https://chromium-review.googlesource.com/956035Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542027}