Perform write barrier on declaring class when adding instrumentation

Since the instrumentation is marked from the declaring class we need
to mark the card so that mod-union tables and card rescanning know
about the update.

This fixes some moving GC crashes on eng builds.

Bug: 24133607

(cherry picked from commit b5bba596)

Change-Id: Ibe8430e32e161d33ce0a6782e8dc252e5c86c8da