RFR: 8337225: Demote maxStack and maxLocals from CodeModel to CodeAttribute [v2]

[Chen Liang]

> As discussed in offline meeting, the max stack and locals information are part of the code attribute and not meaningful for buffered code elements. Computation would be costly and these see no real usage during transformations. Thus, the proposed solution is to move these APIs to be CodeAttribute specific, as this is already how all these APIs' users are using.
> 
> Also removed useless `Writable` on buffered models, and fixed `BufferedMethodBuilder::code` implementation.

Chen Liang 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' of https://github.com/openjdk/jdk into fix/codemodel-maxes
 - Reuse local var management from buffered code builders
 - 8337225: Demote maxStack and maxLocals from CodeModel to CodeAttribute

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20338/files
  - new: https://git.openjdk.org/jdk/pull/20338/files/a1023837..6b93ad70

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20338&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20338&range=00-01

  Stats: 2948 lines in 126 files changed: 587 ins; 2154 del; 207 mod
  Patch: https://git.openjdk.org/jdk/pull/20338.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20338/head:pull/20338

PR: https://git.openjdk.org/jdk/pull/20338