[code-reflection] RFR: Onnx subgraphs, lambda execution and BB removal [v4]

[Adam Sotona]

> Onnx subgraphs, lambda execution and BB removal

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  more BB cleanup

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

Changes:
  - all: https://git.openjdk.org/babylon/pull/326/files
  - new: https://git.openjdk.org/babylon/pull/326/files/b55fc2b1..07202658

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=326&range=03
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=326&range=02-03

  Stats: 37 lines in 2 files changed: 1 ins; 25 del; 11 mod
  Patch: https://git.openjdk.org/babylon/pull/326.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/326/head:pull/326

PR: https://git.openjdk.org/babylon/pull/326