[code-reflection] RFR: ArrayView support for HAT kernels

[Ruby Chen]

Adding an option to read and modify buffers as if they are arrays - e.g. the squares kernel would change from

 @CodeReflection
  public static void kernel(KernelContext kc, S32Arr s32Arr) {
    s32Arr.array(kc.x, s32Arr.array(kc.x) * s32Arr.array(kc.x));
  }

to something like

 @CodeReflection
  public static void kernel(KernelContext kc, S32Arr s32Arr) {
    int[] arr = s32Arr.arrayView();
    arr[kc.x] *= arr[kc.x];
  }

-------------

Commit messages:
 - cleanup
 - Merge branch 'array-view' of ssh://github.com/rbrchen/babylon into array-view
 - Merge branch 'code-reflection' into array-view
 - Refactor arrayview and add Java backend handling
 - minor changes
 - Merge branch 'code-reflection' into array-view
 - Remove excess files
 - Add 2D support and cleanup
 - Merge branch 'code-reflection' into array-view
 - Basic ArrayView support for primitive arrays

Changes: https://git.openjdk.org/babylon/pull/571/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=571&range=00
  Stats: 978 lines in 17 files changed: 889 ins; 63 del; 26 mod
  Patch: https://git.openjdk.org/babylon/pull/571.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/571/head:pull/571

PR: https://git.openjdk.org/babylon/pull/571