ART: Relax verifier aput checking

When checking on a null array, the cases of aput and aput-wide are
shared between integral and floating point types. Be careful to not
reject a valid program.

Bug: 21867457
Bug: 23201502

(cherry picked from commit 4bf4c78a)

Change-Id: I6c54a389c06e40a2dae00995aa16ff08a089e512