Summary: Note nmethods with "old" Methods in them in table to walk instead.
See RFE for more details. Tested with RedefineClasses tests with/without -Xcomp, mach5 tier1-5.
open webrev at http://cr.openjdk.java.net/~coleenp/2019/8221183.01/webrev bug link https://bugs.openjdk.java.net/browse/JDK-8221183 Thanks, Coleen
