[code-reflection] RFR: Experiment with replacing textual representation in classfile with method that builds the model [v12]

[Mourad Abbay]

> Experiment with replacing textual representation in classfile with method that builds the model.
> Note: This PR is based on changes from #272.

Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:

  Separate transformation from testing

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Changes:
  - all: https://git.openjdk.org/babylon/pull/274/files
  - new: https://git.openjdk.org/babylon/pull/274/files/f54adb7d..75743ad8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=274&range=11
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=274&range=10-11

  Stats: 440 lines in 11 files changed: 259 ins; 181 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/274.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/274/head:pull/274

PR: https://git.openjdk.org/babylon/pull/274