[PATCH 02/79] Add support for split barriers extension SPV_INTEL_split_barrier (...

[PATCH 02/79] Add support for split barriers extension SPV_INTEL_split_barrier (#1424) (#1663)

This PR adds support for split barriers and the SPV_INTEL_split_barrier extension.

The related SPIR-V extension spec can be found here:

* https://github.com/KhronosGroup/SPIRV-Registry/pull/136

The related OpenCL C extension spec can be found here:

* https://github.com/KhronosGroup/OpenCL-Docs/pull/765

Co-authored-by: Ben Ashbaugh <ben.ashbaugh@intel.com>
Gbp-Pq: Name 0002-Add-support-for-split-barriers-extension-SPV_INTEL_s.patch