hg: jdk10/jdk10/langtools: 8180745: Add --release 10 as an alias for --release 9

[jan.lahoda at oracle.com]

Changeset: 536064188914
Author:    jlahoda
Date:      2017-05-22 15:50 +0200
URL:       http://hg.openjdk.java.net/jdk10/jdk10/langtools/rev/536064188914

8180745: Add --release 10 as an alias for --release 9
Reviewed-by: mcimadamore

! src/jdk.compiler/share/classes/com/sun/tools/javac/platform/JDKPlatformProvider.java