[code-reflection] RFR: Throw an exception if the compute method is not annotated with @Reflect

[Nadeesh TV]

- Throw an exception if the compute method is not annotated with @Reflect
   -  Add tests
- Code style correction - added spacing consistently

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Commit messages:
 - Remove white space
 - Merge branch 'code-reflection' into compute-method-reflect-error
 - rebase
 - rebase
 - We were needlessly passing accelerator around, as a Lookup carrier
 - Moved scopebuilder down to optkl
 - rebase
 - I messed up prev PR blockId vs blockIdx
 - rebase
 - Seal NDRange interfaces anc simplify HATThreadOp and phases
 - ... and 2 more: https://git.openjdk.org/babylon/compare/a5d2fba0...d935ec89

Changes: https://git.openjdk.org/babylon/pull/774/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=774&range=00
  Stats: 205 lines in 9 files changed: 172 ins; 28 del; 5 mod
  Patch: https://git.openjdk.org/babylon/pull/774.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/774/head:pull/774

PR: https://git.openjdk.org/babylon/pull/774