'Reference handler' thread triggers assert w/ TraceThreadEvents

Summary

Remove the TraceThreadEvents option.

Problem

8062307 is a re-discovery of a problem that was last raised in 2008 but which has been in existence for over ten years. Basically the develop option TraceThreadEvents does not work and is unused. If you specify this flag then the VM will abort with an assertion failure - even "java -version".

Solution

While it is normal to deprecate VM flags before removing them, in this case the flag has been broken and unused for over a decade and so we propose to simply remove it.

Specification

N/A - flag will be removed.