RFR 8027146: Class loading verification failure if GC occurs in Universe::flush_dependents_on

[Coleen Phillimore]

Summary: Remove search in system dictionary and hacks, replace with 
verifying in CLD::_klasses list.

open webrev at http://cr.openjdk.java.net/~coleenp/8027146/
bug link https://bugs.openjdk.java.net/browse/JDK-8027146

Tested with AllocClasses.java with VM_Verify op suggested in the bug 
report (can't add it's noreg-hard).   Also ran all jtreg and gc jtreg 
tests with -XX:+VerifyBeforeGC.

Thanks,
Coleen
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