[code-reflection] Integrated: Removed previous transformer patter experiments

[Gary Frost]

We had various experiments for matching InvokeOp and VarAccessOp code model patterns. 

Replaced use of these with new Invoke an VarAcces helpers and removed dead code.

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Commit messages:
 - Removed previous transformer patter experiments

Changes: https://git.openjdk.org/babylon/pull/805/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=805&range=00
  Stats: 491 lines in 23 files changed: 59 ins; 349 del; 83 mod
  Patch: https://git.openjdk.org/babylon/pull/805.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/805/head:pull/805

PR: https://git.openjdk.org/babylon/pull/805