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

[Adam Sotona]

This reverts commit e1d4ad8030acdcd1082e059080d979eb7e8ffdb8.

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

Commit messages:
 - Revert "ExplicitOnnxOps.If implementation of captured values and initializers"

Changes: https://git.openjdk.org/babylon/pull/358/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=358&range=00
  Stats: 547 lines in 8 files changed: 262 ins; 167 del; 118 mod
  Patch: https://git.openjdk.org/babylon/pull/358.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/358/head:pull/358

PR: https://git.openjdk.org/babylon/pull/358