hg: amber/amber/langtools: Automatic merge with default

[maurizio.cimadamore at oracle.com]

Changeset: 1b6af6906511
Author:    langtools
Date:      2017-04-10 23:15 +0200
URL:       http://hg.openjdk.java.net/amber/amber/langtools/rev/1b6af6906511

Automatic merge with default