[8u-60] request for review and approval to backport JDK-8039262: Java compiler performance degradation jdk1.7 vs. jdk1.6 should be amended

[Jan Lahoda]

Hello,

I'd like to ask for a code review and an approval to backport the 
following fix to 8u-dev:

Bug: https://bugs.openjdk.java.net/browse/JDK-8039262
jdk9 fix: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/aff504edf8a1

The fix does not apply cleanly to 8u-dev/langtools. A webrev for the 
patch updated for 8u-dev is here:
http://cr.openjdk.java.net/~jlahoda/8039262-8/webrev.00/

The changes between the jdk9 and 8u-dev fixes are to adjust the code to 
match the Scope class as it was in 8, and to avoid using 8 features 
(lambdas).

Thanks,
     Jan