[11u] RFR: 8237499: JFR: Include stack trace in the ThreadStart event

[Lindenmaier, Goetz]

HI

I am downporting this for 11.0.10-oracle parity.
http://cr.openjdk.java.net/~goetz/wr20/8237499-jfr_stacktrace-jdk11/01/
I had to do a really trivial resolve in jfrThreadLocal.cpp:55.

https://bugs.openjdk.java.net/browse/JDK-8237499
https://hg.openjdk.java.net/jdk/jdk/rev/6214823ce3d8

Best regards,
  Goetz.