ART: Fix const-method-handle method resolution

The MethodType associated with the const-method-handle should refer to
the method handle's target class, not the declaring class of the
method.

Bug: 115964401
Test: art/test.py --host -r -t 979
Test: art/test.py --host -r -t 714

Change-Id: I5b8f2bb64882a708ade51403f0a1f07e0c102dc2