[8u] RFR for JDK-8027434: "-XX:OnOutOfMemoryError" uses fork instead of vfork to jdk8u-dev

[Muthusamy Chinnathambi]

Hi,
 
Please review the backport of bug: "JDK-8027434: "-XX:OnOutOfMemoryError" uses fork instead of vfork" to jdk8u-dev
Please note that this is not a clean backport due to difference in source path structures.

Webrev:    http://cr.openjdk.java.net/~mchinnathamb/8027434-bp/webrev.00/
jdk12 bug: https://bugs.openjdk.java.net/browse/JDK-8027434
Original patch pushed to jdk12: http://hg.openjdk.java.net/jdk/jdk/rev/101c2b6eacbe

Test:  Ran jprt and jtreg.

Regards,
Muthusamy C