hg: lambda/lambda/jdk: Implements one possible correction of compute() remove case for oldValue==null.

[mike.duigou at oracle.com]

Changeset: c643a1d780c5
Author:    mduigou
Date:      2013-04-18 11:37 -0700
URL:       http://hg.openjdk.java.net/lambda/lambda/jdk/rev/c643a1d780c5

Implements one possible correction of compute() remove case for oldValue==null.

Includes other conformance issues noted by Brent Christian

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