hg: jdk9/dev/langtools: 8158458: Update references from "1.9" to "9"

[jonathan.gibbons at oracle.com]

Changeset: e859adb41c6b
Author:    iris
Date:      2016-06-10 13:52 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/langtools/rev/e859adb41c6b

8158458: Update references from "1.9" to "9"
Reviewed-by: jjg, ksrini

! src/jdk.compiler/share/classes/com/sun/source/doctree/HiddenTree.java