hg: jdk9/sandbox/langtools: Merge

[pavel.rappo at oracle.com]

Changeset: dc491a716284
Author:    prappo
Date:      2016-01-13 14:45 +0000
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/dc491a716284

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