RFR: 8065331: Add JVM trace events for failed allocations

[Marcus Larsson]

Hi,

Please review the following patch adding new trace events for allocations requiring GC, and GCs triggered by allocation. See the JEP for a description of these two new events.

CR:
https://bugs.openjdk.java.net/browse/JDK-8065331

Webrev:
http://cr.openjdk.java.net/~mlarsson/8065331/webrev.00/

JEP:
https://bugs.openjdk.java.net/browse/JDK-8060092

Tests:
jprt, jtreg

Thanks,
Marcus