RFR: 8357473: Compilation spike leaves many CompileTasks in free list [v2]

[Aleksey Shipilev]

> See bug for more discussion.
> 
> This PR implements the "all the way" solution by removing the free list completely. It complements https://github.com/openjdk/jdk/pull/25364, and can go either first, or second. We will remerge the other one once either integrates.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `compiler`
>  - [ ] Linux AArch64 server fastdebug, `all`

Aleksey Shipilev 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 four additional commits since the last revision:

 - Merge branch 'master' into JDK-8357473-compile-task-free-list
 - Also free the lock!
 - Comments and indenting
 - Basic deletion

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25409/files
  - new: https://git.openjdk.org/jdk/pull/25409/files/b9319107..c26b8ae8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25409&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25409&range=00-01

  Stats: 562 lines in 18 files changed: 286 ins; 177 del; 99 mod
  Patch: https://git.openjdk.org/jdk/pull/25409.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25409/head:pull/25409

PR: https://git.openjdk.org/jdk/pull/25409