hg: lambda/lambda/jdk: Change Map.putIfAbsent() to treat null values as absent.

[mike.duigou at oracle.com]

Changeset: f5b67786b6c9
Author:    mduigou
Date:      2013-03-26 22:33 -0700
URL:       http://hg.openjdk.java.net/lambda/lambda/jdk/rev/f5b67786b6c9

Change Map.putIfAbsent() to treat null values as absent.

! src/share/classes/java/util/HashMap.java
! src/share/classes/java/util/Map.java
! test/java/util/Map/Defaults.java