Loom PPC64LE Port

[Reingruber, Richard]

Hi Ron, Alan,

I've started porting loom to ppc64le. Currently a simple hello world
succeeds.

  $ uname -m
  ppc64le
  $ jshell -s --enable-preview -J-Xint
  -> Thread.startVirtualThread(() -> System.out.println("Hi!"));
  Thread.startVirtualThread(() -> System.out.println("Hi!"));
  Hi!

I'll keep the code in the ppc_port branch of my loom fork which I intend to rebase
as needed. Also I will frequently squash commits.

https://github.com/reinrich/loom/tree/ppc_port

Looking forward to learn about (the hotspot part of) loom as I'm hacking
away.

Richard.

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