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This reverts commit 6b5ac2ef.

Reason for revert:
It broke the Win ASan bot on the LKGR waterfall (see second bug).

Original change's description:
> Reland "win: Link with lld instead of MSVC's link.exe by default"
> 
> This is a reland of be8138a4
> The issues with the previous attempt were addressed in the latest
> Clang roll (#553415).
> 
> Original change's description:
> > win: Link with lld instead of MSVC's link.exe by default
> >
> > lld is LLVM's linker. It produces PE/COFF and PDB files just like
> > link.exe, but it's significantly faster and it can also handle LLVM's
> > internal representation, which will enable us to do link-time
> > optimization and control-flow integraty checks with Clang.
> >
> > While lld is much faster at linking, it doesn't support incremental
> > links, meaning builds that only touch a few files and re-link a large
> > executable may become slower.
> >
> > This is the first attempt at switching everything over, with the
> > purpose of gathering data and finding unknown unknowns. It's likely
> > temporary until something breaks.
> >
> > is_win_fastlink is implicitly ignored when using lld, as lld without
> > fastlink is faster than link.exe with it.
> >
> > Also switch the CrWinClangLLD bots on chromium.clang to use MSVC's
> > link.exe to make sure that configuration keeps working.
> >
> > Bug: 792131
> > Change-Id: I0f115a78c33d69eadbd480f75c2a5d636e86483d
> > Reviewed-on: https://chromium-review.googlesource.com/983632
> > Commit-Queue: Nico Weber <thakis@chromium.org>
> > Reviewed-by: Nico Weber <thakis@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#551367}
> 
> Bug: 792131
> Change-Id: I3b76cd015ef18bb3e2ac7a3efa4352c4f04e560b
> Reviewed-on: https://chromium-review.googlesource.com/1028374
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Hans Wennborg <hans@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#553776}

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

Change-Id: Ied5addd2f8d16d1e002bf37846e7106b4c754cb9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 792131, 837090
Reviewed-on: https://chromium-review.googlesource.com/1029631Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553878}