hg: lambda/lambda/jdk: improve correctness for maps containing null values

[mike.duigou at oracle.com]

Changeset: c43188ded0d6
Author:    mduigou
Date:      2013-03-15 15:22 -0700
URL:       http://hg.openjdk.java.net/lambda/lambda/jdk/rev/c43188ded0d6

improve correctness for maps containing null values

! src/share/classes/java/util/Map.java