RFR: 8349146: [REDO] Implement a better allocator for downcalls [v2]

[Per Minborg]

> This PR is based on the work of @mernst-github and aims to implement an _internal_ thread-local 'stack' allocator, which works like a dynamically sized arena, but with reset functionality to reset the allocated size back to a certain level. The underlying memory could stay around between calls, which could improve performance.
> 
> Re-allocated segments are not zeroed between allocations.

Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains nine additional commits since the last revision:

 - Break out stress thest and ProblemList it on macosx
 - Merge branch 'master' into internal-allocator
 - Remove interface level
 - Add benchmark class with virtual executor
 - Add rudimentary documentation
 - Convert class to record and add @ForceInline
 - Refactor and add benchmark
 - Merge branch 'master' into internal-allocator
 - Change set from previous PR

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/24829/files
  - new: https://git.openjdk.org/jdk/pull/24829/files/59e1f261..1e9d0460

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24829&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24829&range=00-01

  Stats: 25178 lines in 770 files changed: 17686 ins; 4783 del; 2709 mod
  Patch: https://git.openjdk.org/jdk/pull/24829.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24829/head:pull/24829

PR: https://git.openjdk.org/jdk/pull/24829