hg: jdk9/sandbox/langtools: 8174073: NPE caused by @link reference to class

[chris.hegarty at oracle.com]

Changeset: 7729c633b9f1
Author:    vromero
Date:      2017-02-08 19:42 -0800
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/7729c633b9f1

8174073: NPE caused by @link reference to class
Reviewed-by: jjg, ksrini

! src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTrees.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Enter.java
+ test/tools/javac/doclint/NPEDuplicateClassNamesTest.java