Make it easier to recognize JNI reference bugs.

CheckJNI is still your best choice, but now, even without CheckJNI, you'll get
a strong clue:

E/dalvikvm( 4168): JNI ERROR (app bug): accessed stale local reference at index 10 (top=8)
E/dalvikvm( 4168): VM aborting

Change-Id: Ia65e1e430bc53509add19816ef06cc5dbd1b3e98
1 file changed