hg: jigsaw/jake/jdk: Improve exception when -Xpatch attempted to module-info.class in patch directory

[alan.bateman at oracle.com]

Changeset: d69b0b635f4f
Author:    alanb
Date:      2016-02-28 13:58 +0000
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/d69b0b635f4f

Improve exception when -Xpatch attempted to module-info.class in patch directory

! src/java.base/share/classes/jdk/internal/module/ModulePatcher.java