hg: amber/amber/langtools: initial push enhanced-enums branch

[vicente.romero at oracle.com]

Changeset: a08552de22be
Author:    vromero
Date:      2017-03-23 10:55 -0700
URL:       http://hg.openjdk.java.net/amber/amber/langtools/rev/a08552de22be

initial push enhanced-enums branch