RFR: 8341141: Optimize DirectCodeBuilder [v7]

[Shaojin Wen]

> Some DirectCodeBuilder related optimizations to improve startup and running performance:
> 1. Merge calls, merge writeU1 and writeU2 into writeU3
> 2. Merge calls, merge writeU1 and writeIndex operations
> 3. Directly use writeU1 instead of writeBytecode
> 4. Rewrite the implementation of load and store

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 60 additional commits since the last revision:

 - Merge branch 'master' into optim_direct_code_builder_202409
 - optimize writeBranch
 - Local var clean
 - 8340621: Open source several AWT List tests
   
   Reviewed-by: prr
 - 8340639: Open source few more AWT List tests
   
   Reviewed-by: prr
 - 8340560: Open Source several AWT/2D font and rendering tests
   
   Reviewed-by: kizune
 - 8340721: Clarify special case handling of unboxedType and getWildcardType
   
   Reviewed-by: prappo, mcimadamore
 - 8341101: [ARM32] Error: ShouldNotReachHere() in TemplateInterpreterGenerator::generate_math_entry after 8338694
   
   Reviewed-by: shade
 - 8340404: CharsetProvider specification updates
   
   Reviewed-by: alanb, naoto
 - 8337679: Memset warning in src/hotspot/share/adlc/adlArena.cpp
   
   Reviewed-by: stefank, thartmann, jwaters
 - ... and 50 more: https://git.openjdk.org/jdk/compare/8ac2b68e...b69800dc

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21243/files
  - new: https://git.openjdk.org/jdk/pull/21243/files/d6c34593..b69800dc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21243&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21243&range=05-06

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21243.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21243/head:pull/21243

PR: https://git.openjdk.org/jdk/pull/21243