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

[Adam Sotona]

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

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Commit messages:
 - removed debug line
 - Fix of the OnnxTransformer
 - Re-application of the problematic ExplicitOnnxOps.If implementation of captured values and initializers

Changes: https://git.openjdk.org/babylon/pull/359/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=359&range=00
  Stats: 558 lines in 7 files changed: 182 ins; 285 del; 91 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