RFR: 8341664: ReferenceClassDescImpl cache internalName [v6]

[Shaojin Wen]

> ReferenceClassDescImpl caches internalName to avoid creating a new String object for each call, which can also simplify the implementation of classfile.

Shaojin Wen 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 eight additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into optim_internal_name_202410
 - Merge remote-tracking branch 'upstream/master' into optim_internal_name_202410
 - Merge remote-tracking branch 'upstream/master' into optim_internal_name_202410
 - Merge remote-tracking branch 'upstream/master' into optim_internal_name_202410
 - Merge remote-tracking branch 'upstream/master' into optim_internal_name_202410
 - suggestion from @liach
 - stable
 - ReferenceClassDescImpl cache internalName

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21373/files
  - new: https://git.openjdk.org/jdk/pull/21373/files/a18164f2..77549c52

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21373&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21373&range=04-05

  Stats: 24424 lines in 722 files changed: 19635 ins; 2228 del; 2561 mod
  Patch: https://git.openjdk.org/jdk/pull/21373.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21373/head:pull/21373

PR: https://git.openjdk.org/jdk/pull/21373