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

[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)`.

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Depends on: https://git.openjdk.org/jdk/pull/20627

Commit messages:
 - Sneaky import
 - 8338545: Functional interface implementations for common pre-boot ClassFile operations

Changes: https://git.openjdk.org/jdk/pull/20629/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20629&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338545
  Stats: 139 lines in 11 files changed: 33 ins; 63 del; 43 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