[8u] Request for enhancement backport approval for CR JDK-8027434: "-XX:OnOutOfMemoryError" uses fork instead of vfork

[Muthusamy Chinnathambi]

Hi,

May I get the approval of enhancement backport of 'JDK-8027434: "-XX:OnOutOfMemoryError" uses fork instead of vfork' to jdk8u-dev.

Jdk12 bug: https://bugs.openjdk.java.net/browse/JDK-8027434 

Short description of the change:
When the system does not have enough memory available to fork, the option "-XX:OnOutOfMemoryError" may not work. Even a simple command "kill" does not get executed. This change is to use vfork instead of fork during "OnOutOfMemoryError".

I have tested it with the jprt and jtreg tests.

Regards,
Muthusamy C