hg: jdk9/sandbox/jdk: 2 new changesets

[aleksey.shipilev at oracle.com]

Changeset: 426125c241af
Author:    shade
Date:      2015-08-31 18:25 +0300
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/426125c241af

Merge


Changeset: 8976a71d6521
Author:    shade
Date:      2015-08-31 23:04 +0300
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/8976a71d6521

Add more tests, fix boolean/char constants regression

! test/java/lang/String/ImplicitStringConcatShapes.java