RFR 8009728: nsk/jvmti/AttachOnDemand/attach030 crashes on Win32

[Coleen Phillimore]

Summary: ActiveMethodOopsCache was used to keep track of old versions of 
some methods that are cached in Universe but is buggy with permgen 
removal and not needed anymore

There was a crash in this function that I couldn't reproduce.  It was 
likely that the crash was for something else, but this is a lurking bug.

open webrev at http://cr.openjdk.java.net/~coleenp/8009728/
bug link at http://bugs.sun.com/view_bug.do?bug_id=8009728
local bug link https://jbs.oracle.com/bugs/browse/JDK-8009728

Tested with vm.quick.testlist which includes redefine classes tests and 
jck lang and vm tests.

Thanks,
Coleen