RFR: 8341664: ReferenceClassDescImpl cache internalName [v2]

[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 four additional commits since the last revision:

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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21373/files
  - new: https://git.openjdk.org/jdk/pull/21373/files/478f97f9..ef54ed21

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21373&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21373&range=00-01

  Stats: 9917 lines in 194 files changed: 8099 ins; 580 del; 1238 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