[8u] RFR: 8138745: Implement ExitOnOutOfMemory and CrashOnOutOfMemory in HotSpot

[cheleswer sahu]

Hi!

Please review the code changes for "https://bugs.openjdk.java.net/browse/JDK-8138745". I have built the JDK8 and tested already.
As some of the API's are not available or have some different signature in JDK8, I have done some code changes to make the JDK9 change-set appropriate for JDK8.
  
JDK9 changeset: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/cbc2d5fbdae1
Webrev Link: http://cr.openjdk.java.net/~dbuck/8138745_8u_01/

Regards,
Cheleswer