[code-reflection] RFR: Adjusted tests to use execution of a method and implementation of the execution model cache

[Adam Sotona]

Adjusted tests to use execution of a method and implementation of the execution model cache.

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Commit messages:
 - Merge remote-tracking branch 'babylon/code-reflection' into onnx-execute-cache
 - implemented operands shuffling + test
 - caching models instead of the session
 - primitive caching of the last session
 - adjusted tests to use execution of a method (no initializers yet)
 - Ensure arguments are mapped correctly.
 - Short cut for single method execution

Changes: https://git.openjdk.org/babylon/pull/331/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=331&range=00
  Stats: 160 lines in 4 files changed: 70 ins; 45 del; 45 mod
  Patch: https://git.openjdk.org/babylon/pull/331.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/331/head:pull/331

PR: https://git.openjdk.org/babylon/pull/331