[code-reflection] Integrated: Decouple example-experiments from opencl + add example_arrayview to intellij

[Gary Frost]

Some housekeeping.  

We should never have example-experiments which depend on a specific backend.  We had two Mesh.java and MinBufferTest.java 

Otherwide `@hat/exp yada experiment` will always pick up the specific backend and will ignor ethe one provided. 

I also fixed the HatOpenCLKernelBuilder in jextracted opendl.  I think this needs removing, but at least it compiles now.

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Commit messages:
 - Decouple example-experiments from opencl backend + add example_arrayview to intellij proj

Changes: https://git.openjdk.org/babylon/pull/608/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=608&range=00
  Stats: 256 lines in 8 files changed: 233 ins; 18 del; 5 mod
  Patch: https://git.openjdk.org/babylon/pull/608.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/608/head:pull/608

PR: https://git.openjdk.org/babylon/pull/608