RFR: 8357473: Compilation spike leaves many CompileTasks in free list

Fri May 23 10:05:26 UTC 2025

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`

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Commit messages:
 - Comments and indenting
 - Basic deletion

Changes: https://git.openjdk.org/jdk/pull/25409/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25409&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357473
  Stats: 113 lines in 4 files changed: 14 ins; 62 del; 37 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