RFR: 8307818: Convert Indify tool to Classfile API [v15]

[Oussama Louati]

> An indify tool in j.l.i tests (also in vmTestBase) convert some source-code private static methods with MT_ MH_, and INDY_ prefixes into MethodHandle, MethodType, and CallSite constants.
> It currently uses ad-hoc code to process class files and intends to migrate to ASM; but since we have the Classfile API, we can migrate to Classfile API instead.

Oussama Louati has updated the pull request incrementally with one additional commit since the last revision:

  fix: review addressing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18841/files
  - new: https://git.openjdk.org/jdk/pull/18841/files/03ec3ed6..c5a08302

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18841&range=14
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18841&range=13-14

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18841.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18841/head:pull/18841

PR: https://git.openjdk.org/jdk/pull/18841