Handle primitive types in VerifierTypes::AddAssignability.

The dex2dex compiler might indirectly call it with arrays
of primitives.

Also remove dead APUT_OBJECT optimization in VerifiedMethod.
It was added for optimizing Quick:
https://googleplex-android-review.googlesource.com/#/c/371193

Commit hash:
a9a8254c

But Quick is gone.

Test: 630-safecast-array
bug: 33498750, 32546807, 32546608

Change-Id: Icfd3f8d915bfe225f05dbec42f9ba25dc1243fdc