Let win_clang trybot and WinClang64 (dbg) main waterfall bot do relea…

…se builds.

We most care about having release MSVC builds working, so make that the
configuration we test on the main waterfall.

Bug: 751198
Change-Id: I3d939b50351bd3112a9b079a87087e2a729394f8
Reviewed-on: https://chromium-review.googlesource.com/596747
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491120}

tools/mb/mb_config.pyl

@@ -437,7 +437,7 @@
       'Win Builder (dbg)': 'debug_bot_x86_minimal_symbols',
       'Win x64 Builder': 'release_bot_minimal_symbols',
       'Win x64 Builder (dbg)': 'debug_bot_minimal_symbols',
-      'WinClang64 (dbg)': 'win_clang_debug_bot',
+      'WinClang64 (dbg)': 'win_clang_release_bot',
     },
 
     'internal.client.kitchensync': {
@@ -647,7 +647,7 @@
       'win_chromium_rel_ng': 'gpu_tests_release_trybot_x86_minimal_symbols',
       'win_chromium_syzyasan_rel': 'syzyasan_no_pch_release_x86',
       'win_chromium_x64_rel_ng': 'release_trybot_minimal_symbols',
-      'win_clang': 'win_clang_debug_bot',
+      'win_clang': 'win_clang_release_bot',
       'win_clang_dbg': 'clang_debug_trybot_x86',
       'win_clang_rel': 'clang_official_release_trybot_x86',
       'win_clang_x64_dbg': 'win_clang_debug_bot',
@@ -1548,6 +1548,13 @@
       'no_clang', 'debug_bot', 'minimal_symbols',
     ],
 
+    'win_clang_release_bot': [
+      # Now that the default win bots use clang, use a "clang" bot to make sure
+      # things stay compilable with msvc. TODO(thakis): Having a "clang" bot
+      # check that is very confusing, so rename the bot to "msvc".
+      'no_clang', 'release_bot', 'minimal_symbols',
+    ],
+
     'windows_analyze': [
       'no_symbols', 'no_pch', 'shared', 'x86', 'win_analyze',
     ],