RFR: 8371701: Add ability to set NUMA-affinity for threads [v6]

[Joel Sikström]

> Hello,
> 
> This PR adds support for setting the affinity of threads to run on CPUs associated with specific NUMA nodes on Linux. Support for this is needed for [JDK-8371702](https://bugs.openjdk.org/browse/JDK-8371702) to improve performance in the Relocation Phase of ZGC on a NUMA machine.
> 
> Testing:
> * I've run significant performance testing locally on a NUMA machine and performed functional testing to see that the affinity is actually changed. Affinity of a thread can be inspected on Linux using `taskset -cp <tid>`.
> * Running through Oracle's tier1-2

Joel Sikström has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge branch 'master' into JDK-8371701_numa_affinity_threads
 - Offline review feedback from Axel
 - Harden comment around user configuration
 - Remove comparison
 - Change return type of numa_set_thread_affinity to void
 - 8371701: Add ability to set NUMA-affinity for threads

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Changes: https://git.openjdk.org/jdk/pull/28261/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28261&range=05
  Stats: 103 lines in 6 files changed: 103 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28261.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28261/head:pull/28261

PR: https://git.openjdk.org/jdk/pull/28261