[8u20] request for approval to backport JDK-8043253: Slow javac compile times in JDK 8

[Maurizio Cimadamore]

Hello,

I'd like to ask for an approval to backport fix for:

Bug: https://bugs.openjdk.java.net/browse/JDK-8043253
Backport bug: https://bugs.openjdk.java.net/browse/JDK-8047348
jdk9 fix: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/f4ea5dca6498

Thanks
Maurizio