Add support to indicate whether intrinsics require a dex cache

A structural change to indicate whether a given intrinsic requires access
to a dex cache.  I updated the needs_environment_ field to indicate
whether an HInvoke needs an environment or a dex cache, and if an HInvoke
represents an intrisified method, we utilize this field to determine if
the HInvoke needs a dex cache.

Bug: 21481923
Change-Id: I9dd25a385e1a1397603da6c4c43f6c1aea511b32