[8u40] Request for backport approval 8049631: javac, Gen.LVTAssignAnalyzer should be refactored, it shouldn't be a static class

[Vicente-Arturo Romero-Zaldivar]

Please approve this backport of the fix for JDK-8049631 to 8u40.

Bug: https: //bugs.openjdk.java.net/browse/JDK-8042347
Backport: //bugs.openjdk.java.net/browse/JDK-8049631 
<https://bugs.openjdk.java.net/browse/JDK-8049631>
Changeset: http://hg.openjdk.java.net/jdk9/jdk9/langtools/rev/0d89f8b94872

The patch applies cleanly.

Just to double check, the repo for 8u40 is currently: 
http://hg.openjdk.java.net/jdk8u/jdk8u-dev/, right?

Thanks,
Vicente