RFR: 8338545: Functional interface implementations for common pre-boot ClassFile operations [v3]

[Chen Liang]

> Some ad-hoc lambdas and classes for functional calls to ClassFile API in early bootstrap can be replaced with a few fixed factories. This allows some methods to be used at early bootstrap with less class loading costs.
> 
> Depends on #20627, as this adds another fix to one of the fixes there on `ClassBuilder::withMethodBody(String, MethodTypeDesc, int, Consumer)`.

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 four additional commits since the last revision:

 - Merge branch 'master' into feature/cf-shared-lambdas
 - Sneaky import
 - 8338545: Functional interface implementations for common pre-boot ClassFile operations
 - 8338543: ClassBuilder withMethod builders should cache the method type symbol

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20629/files
  - new: https://git.openjdk.org/jdk/pull/20629/files/07b93802..97a3eed7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20629&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20629&range=01-02

  Stats: 928 lines in 45 files changed: 698 ins; 56 del; 174 mod
  Patch: https://git.openjdk.org/jdk/pull/20629.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20629/head:pull/20629

PR: https://git.openjdk.org/jdk/pull/20629