[code-reflection] RFR: Float4 arrayView support

[Ruby Chen]

Preliminary `Float4` support for arrayViews. Currently only supported for `F32ArrayPadded` buffers, which can be accessed like a `Float4[]` as shown below:

Float4[] arr = buffer.float4ArrayView(); // for a F32ArrayPadded buffer

At the moment, to use an element in the array, the `Float4` must be loaded into a separate variable first, i.e.

Float4 a = arr[index * 4];

A value can be stored into the array through the following syntax:

arr[index * 4] = ...

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Commit messages:
 - Cleaning up vector arrayView
 - Merge branch 'code-reflection' into array-view
 - Float4 arrayView support

Changes: https://git.openjdk.org/babylon/pull/646/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=646&range=00
  Stats: 1644 lines in 13 files changed: 1222 ins; 399 del; 23 mod
  Patch: https://git.openjdk.org/babylon/pull/646.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/646/head:pull/646

PR: https://git.openjdk.org/babylon/pull/646