RFR: 8344548: Incorrect StartAggressiveSweepingAt doc for segmented code cache [v2]

[hanguanqiang]

> The flag StartAggressiveSweepingAt triggers aggressive code cache sweeping based on the percentage of free space in the entire code cache. The previous description referenced segmented vs non-segmented code cache, which is confusing and does not reflect the current implementation.
> 
> This patch updates the flag description to clearly state that the threshold is based on the total code cache free percentage, regardless of segmentation.

hanguanqiang 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 three additional commits since the last revision:

 - correct a compile error
 - Merge remote-tracking branch 'upstream/master' into 8344548
 - 8344548: Incorrect StartAggressiveSweepingAt doc for segmented code cache
   
   The flag StartAggressiveSweepingAt triggers aggressive code cache sweeping based on the percentage of free space in the entire code cache. The previous description referenced segmented vs non-segmented code cache, which is
   confusing and does not reflect the current implementation.
   
   This patch updates the flag description to clearly state that the threshold is based on the total code cache free percentage, regardless of segmentation.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26114/files
  - new: https://git.openjdk.org/jdk/pull/26114/files/698a3f28..cb1b2c60

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26114&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26114&range=00-01

  Stats: 3295 lines in 114 files changed: 2197 ins; 812 del; 286 mod
  Patch: https://git.openjdk.org/jdk/pull/26114.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26114/head:pull/26114

PR: https://git.openjdk.org/jdk/pull/26114