Fix a few more JDWP bugs.
Fix a few more JDWP bugs.

My previous division by 2 of dex PCs was wrong-headed. I need to fix the test
instead to not try to set a breakpoint in the middle of an instruction.

Also, we weren't reporting some class-specific events that we should have done
because of an InstanceOf/IsAssignableFrom mixup.

Change-Id: I187fc0977955038270866c9d7d28b0a709408aa0

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst