Libcore: Add classloader to dex cache

Live dex caches must keep their associated classloader live. Otherwise
the classloader may get unloaded, attempting to free DexFiles which
cannot be unregistered.

Companion to ART change.

Test: art/test/testrunner/testrunner.py -b --host
Change-Id: I0eed5b3b46ed681c739d6923a57d0878afbba1a7
1 file changed