Fix new bss roots assertion during marking phase

Earlier we are asserting that a bss root can only be a class. But it's
also possible to be a string.

Also enables 092-locale art-test.

Bug: 288532125
Bug: 288603111
Test: art/test/testrunner/testrunner.py --host -t 092-locale
Change-Id: I1e64f571b4ab7121b75c0902b2b4477dc086f13b
2 files changed