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This reverts commit be8138a4.

Reason for revert: broke checkbins on 32-bit, https://crbug.com/833951

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}

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

Change-Id: Ia6060fe909656ce5903cf6906beb8b5e4ef538c7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 792131
Reviewed-on: https://chromium-review.googlesource.com/1015141Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551384}