[build] Add configs for new msvc trybot

NOTRY=true

Change-Id: I30bb7c1935db33e49729ea66a8535809531c7130
Reviewed-on: https://chromium-review.googlesource.com/970642Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52060}

infra/mb/mb_config.pyl

@@ -224,6 +224,7 @@
       'v8_win64_asan_rel_ng': 'release_x64_asan_no_lsan',
       'v8_win64_msvc_compile_rel': 'release_x64_msvc',
       'v8_win64_dbg': 'debug_x64_minimal_symbols',
+      'v8_win64_msvc_rel_ng': 'release_x64_msvc',
       'v8_win64_rel_ng': 'release_x64_trybot',
       'v8_mac64_gc_stress_dbg': 'debug_x64_trybot',
       'v8_mac64_rel_ng': 'release_x64_trybot',