GitLab

We want to replace win_clang and WinClang64 (dbg) which currently do
release MSVC builds on CQ and main waterfall respectively with win_msvc
and win_msvc_dbg / WinMSVC64 and WinMSVC64 (dbg) to

1.) get both release and debug coverage
2.) have less confusing bot names at least on CQ and main waterfall.

This adds mb configs for the new bot names.

Bug: 777642,751220
Change-Id: I79aa4a41554e9961dfc3fdad5922c590bb603d38
Reviewed-on: https://chromium-review.googlesource.com/746535
Commit-Queue: Hans Wennborg <hans@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513197}