[code-reflection] RFR: Hat query experiments

[Gary Frost]

I cleaned up ArrayView (we had some overlap beteen local helpers and OpHelper) 

Added some preliminary experiments building common Queries on the model

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Commit messages:
 - Some ArrayView cleanup and Query experiments
 - Simplify Generics
 - Initial implementation

Changes: https://git.openjdk.org/babylon/pull/828/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=828&range=00
  Stats: 599 lines in 10 files changed: 482 ins; 67 del; 50 mod
  Patch: https://git.openjdk.org/babylon/pull/828.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/828/head:pull/828

PR: https://git.openjdk.org/babylon/pull/828