hg: jdk9/sandbox/langtools: Merge

[magnus.ihse.bursie at oracle.com]

Changeset: 4a164e957f91
Author:    ihse
Date:      2016-01-20 10:46 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/4a164e957f91

Merge

- test/tools/javac/api/T6430241.java
- test/tools/javac/file/BootClassPathPrepend.java
- test/tools/javac/util/context/T7021650.java
- test/tools/sjavac/ExclPattern.java