RFR: 8062608: BCEL corrupts debug data of methods that use generics

[david buck]

Hi!

May I please have a review of this fix:

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8062608
WEBREV: http://cr.openjdk.java.net/~dbuck/8062608/webrev.00/

Cheers,
-Buck