[code-reflection] RFR: ExplicitOnnxOps.If implementation of captured values and initializers [v6]

[Adam Sotona]

> ExplicitOnnxOps.If implementation of captured values and initializers - another attempt to do it right
> 
> + raw minimal support of variadic inputs and outputs
> + continuation work on If and Loop

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

  Loop op - work in progress

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

Changes:
  - all: https://git.openjdk.org/babylon/pull/359/files
  - new: https://git.openjdk.org/babylon/pull/359/files/9e5cf88a..15edc4de

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=359&range=05
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=359&range=04-05

  Stats: 15 lines in 4 files changed: 6 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/babylon/pull/359.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/359/head:pull/359

PR: https://git.openjdk.org/babylon/pull/359