Intrinsify currentThread()

Tue Jul 28 14:10:54 UTC 2020

I pushed a patch which intrinsifies currentThread() to something much more
efficient than what we have. It's quite a big change, so I've tested it as
much as I can.

There should be no externally-visible changes. If there are, please shout.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671