hg: jigsaw/jake/langtools: Fix bug entering duplicate cass symbols

[jonathan.gibbons at oracle.com]

Changeset: b4ca7d930f0f
Author:    jlahoda
Date:      2015-12-15 13:00 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jake/langtools/rev/b4ca7d930f0f

Fix bug entering duplicate cass symbols
Reviewed-by: jjg

! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symtab.java
! test/tools/javac/modules/EdgeCases.java
! test/tools/lib/ModuleTestBase.java