Add skip for 1946-asan + interp-ac

This combination is so slow the test won't finish in the 15 minute
timeout.

Test: SANITIZE_HOST=address ./test/testrunner/testrunner.py -b --host --interp-ac -t 1946
Change-Id: Idf17570aac82f0fcbbd10be03ee91223319878d7
1 file changed