RFR : 8011200 : Optimize empty ArrayList/HashMap

[Mike Duigou]

Hello All;

This is an early review of the JDK 7u backport for this issue. Testing and enduser feedback is still ongoing with the JDK 8 version of this patch which was pushed about two weeks ago and the same fix is now available in preview release b86 and later (https://jdk8.java.net/download.html)

http://cr.openjdk.java.net/~mduigou/JDK-8011200/7u.0/webrev/

The differences between the Java 8 and Java 7 versions of this patch are very minor. Early next week, assuming all goes well, I will submit the official "Request for approval" to integrate this into JDK 7u-dev.

Thanks,

Mike