Review request for JDK-8007718

[Hannes Wallnoefer]

Please review webrev for JDK-8007718: Make static RegExp properties 
compatible to other engines.

http://cr.openjdk.java.net/~hannesw/8007718/

This defines non-standard properties on RegExp constructor as ordinary 
properties. The test script now prints the same results for V8, 
Spidermonkey and Nashorn.

Note that this requires patch for JDK-8007627 (@Getter annotation on 
constructor) in order to run.

Hannes