RFR (M) 8078725: method adjustments can be done just once for all classes involved into redefinition

[coleen.phillimore at oracle.com]

Summary: walk all classes at the end of redefinition and adjust method 
entries and clean MethodData

This improves performance for redefining multiple classes at once. See 
CR for more information.

Tested with redefinition tests in repository, and hs tier1-3.

make test TEST=open/test/hotspot/jtreg/vmTestbase/nsk/jvmti >&jvmti.out
make test TEST=open/test/hotspot/jtreg/vmTestbase/nsk/jdi >&jdi.out
make test TEST=open/test/hotspot/jtreg/runtime/RedefineTests >&redefine.out
make test TEST=open/test/hotspot/jtreg/runtime/logging >&logging.out
make test TEST=open/test/jdk/java/lang/instrument >&instrument.out
make test TEST=open/test/jdk/com/sun/jdi >&jtreg.jdi.out

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8078725.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8078725

Thanks,
Coleen