hg: jdk9/dev/jdk: 8171400: Move checking of duplicate packages in the boot layer to link time

[claes.redestad at oracle.com]

Changeset: ac9e421de591
Author:    redestad
Date:      2016-12-19 21:38 +0100
URL:       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/ac9e421de591

8171400: Move checking of duplicate packages in the boot layer to link time
Reviewed-by: alanb

! src/java.base/share/classes/java/lang/reflect/Layer.java
! src/java.base/share/classes/jdk/internal/module/ModuleBootstrap.java
! src/java.base/share/classes/jdk/internal/module/SystemModules.java
! src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/SystemModulesPlugin.java