[gardening] Disable exception caused by missing core dumps on windows

Issue #36469

Change-Id: I57d53d1ef02841e1f5c9f9993f896a8d20ee6f18
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98670
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>

tools/utils.py

@@ -907,7 +907,9 @@ def _report_missing_crashes(self, missing, throw=True):
         "Existing files which *did not* match the pattern inside the search "
         "directory are are:\n  %s"
         % (missing_as_string, self._search_dir, '\n  '.join(other_files)))
-    if throw:
+    # TODO: Figure out why windows coredump generation does not work.
+    # See http://dartbug.com/36469
+    if throw and GuessOS() != 'win32':
       raise Exception('Missing crash dumps for: %s' % missing_as_string)
 
   def _get_file_name(self, file):