[code-reflection] Integrated: Tweak order of arena parameter in OnnxRuntime::execute

[Maurizio Cimadamore]

As the subject say, this is a trivial change to make the code lambda the last parameter of the `OnnxRuntime::execute` methods.

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Commit messages:
 - Tweak order of arena parameter in OnnxRuntime::execute

Changes: https://git.openjdk.org/babylon/pull/334/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=334&range=00
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/babylon/pull/334.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/334/head:pull/334

PR: https://git.openjdk.org/babylon/pull/334