[code-reflection] RFR: Proposal for supporting Float4.of for CPU host code and GPU device code [v7]

[Juan Fumero]

> This PR adds support for creating float4 objects within the device code:
> 
> 
> Float4 f = Float4.of(x, y, z ,w)
> 
> 
> In addition, it provides a CPU implementation for this type a new method to operate in `lanewise`. This operation is CPU only at the moment:
> 
> 
> Float4 vA ... 
> Float4 vB ... 
> Float4 vC = vA.linewise(vB, Float::sum);

Juan Fumero has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 15 additional commits since the last revision:

 - Merge branch 'code-reflection' into hat/float4/of
 - [hat] config bits message fixed
 - [hat] Log Config bits for OpenCL moved to OpenCL backend instantiation
 - [hat] Dialect for handling vector types simplified
 - [hat] minor refactor ocl-codegen
 - [hat] codegen - cleanup old OpenCL typecasts
 - [hat] Move vectorOf codegen method to common C99 codegen
 - [hat] minor change
 - [hat] makeFloat4 from immutable supported on GPU
 - [hat][wip] float4 implementation with mutable/immutable variants
 - ... and 5 more: https://git.openjdk.org/babylon/compare/8d67a217...aec780a9

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

Changes:
  - all: https://git.openjdk.org/babylon/pull/642/files
  - new: https://git.openjdk.org/babylon/pull/642/files/251f1a52..aec780a9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=642&range=06
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=642&range=05-06

  Stats: 494433 lines in 6718 files changed: 341377 ins; 104665 del; 48391 mod
  Patch: https://git.openjdk.org/babylon/pull/642.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/642/head:pull/642

PR: https://git.openjdk.org/babylon/pull/642