RFR: 8064516: BCEL still corrupts generic methods if bytecode offsets are modified

[david buck]

Hi!

May I please have a review of this fix:

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8064516
WEBREV: http://cr.openjdk.java.net/~dbuck/8064516/webrev00/

Cheers,
-Buck