hg: jdk9/sandbox/langtools: Merge

[michael.x.mcmahon at oracle.com]

Changeset: 593c62648fc3
Author:    michaelm
Date:      2016-02-25 09:14 +0000
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/593c62648fc3

Merge

- test/tools/javac/6521805/T6521805a.java
- test/tools/javac/6521805/T6521805a_1.out
- test/tools/javac/6521805/T6521805a_2.out
- test/tools/javac/diags/examples/WarnSyntheticNameConflict.java