Fix a tracked reference leak in dvmGenerateProxyClass.

Bug: https://code.google.com/p/android/issues/detail?id=43919
Change-Id: Ib5c217368ba75f4422d0c932c2c67daaaeddea4b
Remove dead instruction in common_exceptionThrown.

Addresses bug: https://code.google.com/p/android/issues/detail?id=43920

Change-Id: Ie735222db17b883416543ca5617b4f02fd8a8d76
Remove stray references to non-existent opcodes.

Change-Id: I83ca6ea12344a8df7ef14d600baf5060b76870f5