hg: code-tools/jol: 7901883: GraphLayout.add modifies "this", while should add to result

[ashipile at redhat.com]

Changeset: 546ab7ad77ba
Author:    shade
Date:      2017-01-18 10:59 +0100
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/546ab7ad77ba

7901883: GraphLayout.add modifies "this", while should add to result

! jol-core/src/main/java/org/openjdk/jol/info/GraphLayout.java
! jol-core/src/test/java/org/openjdk/jol/info/GraphLayoutTest.java