RFR: 8329661: Refactor ScavengableNMethods::verify_unlisted_nmethods [v2]

[Albert Mingkun Yang]

> Simple removing redundant verification.

Albert Mingkun Yang 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:

 - Merge branch 'master' into s1-young-nmethod
 - review
 - s1-young-nmethod

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18621/files
  - new: https://git.openjdk.org/jdk/pull/18621/files/aac5ca15..d91781d8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18621&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18621&range=00-01

  Stats: 236 lines in 10 files changed: 44 ins; 154 del; 38 mod
  Patch: https://git.openjdk.org/jdk/pull/18621.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18621/head:pull/18621

PR: https://git.openjdk.org/jdk/pull/18621