RFR: 8319980: [JVMCI] libgraal should reuse Thread instances as C2 does

[Doug Simon]

On Mon, 13 Nov 2023 18:44:38 GMT, Tom Rodriguez <never at openjdk.org> wrote:

> Reuse Threads instances for compiler threads in the same way C1/C2 do.  This has been in use for several months now.  mach5 testing is underway.

Marked as reviewed by dnsimon (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16638#pullrequestreview-1727993734