This is a reland of cc93cebf

Re-landing after mb_config.pyl fix.

Original change's description:
> Update cq.cfg for new compile-only builders.
>
> This removes the x64 versions of the Windows tests from the ANGLE CQ.
> They are still available to run as optional try jobs, if we suspect
> a failure. This should reduce the amount of test duplication while
> still keeping complete coverage.
>
> It also updates the Clang builder to the MSVC builder, since Chrome
> has switched to Clang by default on Windows, and the clang builder
> was a deprecated version of the MSVC builder anyway.
>
> Bug: chromium:786044
> Change-Id: I786fe85dcdaa57b55b0b44244797c9285c577ea2
> Reviewed-on: https://chromium-review.googlesource.com/782402
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Bug: chromium:786044
Change-Id: I85d1fe95d12a29e91755303423dd151450bb6a3b
Reviewed-on: https://chromium-review.googlesource.com/784232Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>