RFR 8230162: ScopeImpl.remove() has O(N) performance

[Ron Shapiro]

Hi

Please review the following patch to address O(N) performance in
ScopeImpl.remove().

bug: https://bugs.openjdk.java.net/browse/JDK-8230162
webrev: http://cr.openjdk.java.net/~ronsh/8230162/webrev.00/

Note that the patch was prepared by my coworker, Brad (cc'd). I wasn't sure
what to do to make sure that he was attributed correctly.

Thanks,
Ron
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