[code-reflection] RFR: ExplicitOnnxOps.If implementation of captured values and initializers [v2]

[Adam Sotona]

> ExplicitOnnxOps.If implementation of captured values and initializers - another attempt to do it right

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

  added minimal support for variadic parameter + SimpleTest::testConcat

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Changes:
  - all: https://git.openjdk.org/babylon/pull/359/files
  - new: https://git.openjdk.org/babylon/pull/359/files/100683d4..69f9d1ab

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=359&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=359&range=00-01

  Stats: 37 lines in 3 files changed: 34 ins; 0 del; 3 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