The ASSERT in ContextVk::endEventLogForClearOrQuery() was wrong.
Certain glClear*, glBeginQuery*, and glEndQuery* commands may exit
early (e.g. noop).  When this happens, mQueryEventType will be set to
NotInQueryCmd.  In such cases, return without trying to finish a
non-started debug-util-marker hierarchy.

Bug: b/191489405
Change-Id: If40ed00fdc6e420ae6a11c2aeaced19e5aa45a5f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2973342Reviewed-by: Trevor David Black <vantablack@google.com>
Reviewed-by: Mark Lobodzinski <mark@lunarg.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>