* Publish the header for the vulkan-shader-profiler embedded reflection non-semantic instruction set

vulkan-shader-profiler is a tool based on perfetto to help vulkan
developer profil their applications.
First on the Host side using perfetto, but then using the extractor
and the runner, this tools allow to get inside about a shader using
counters (based on SPV_KHR_shader_clock)

* Update include/spirv/unified1/NonSemanticVkspReflection.h

Co-authored-by: Ben Ashbaugh <ben.ashbaugh@intel.com>

* Revert "Update include/spirv/unified1/NonSemanticVkspReflection.h"

This reverts commit 3c9c24db2949c59926bd25d777e10ab60ae2cb9c.

---------

Co-authored-by: Ben Ashbaugh <ben.ashbaugh@intel.com>

* Add JSON grammars for extened instruction sets

Add AMD extended instruction sets
Add DebugInfo
Add OpenCL.DebugInfo.100

* Add script to generate C headers from extinst grammar

This is cloned then adapted from the same-named script in SPIRV-Tools
(contributed under same authorship but different copyright).

Invoke the script as part of the overall header generation script.

* Add generated C header for extended instruction sets

Add for DebugInfo and OpenCLDebugInfo
Add for AMD vendor extended instruction sets

* Update the README for extinst header generation

* Fix header include guard to match directory structure

* Ensure generated header ends in newline

* Fix typo in file reference

* Fix name of AMD_shader_explicit_vertex_parameter.h

* Avoid duplicate generation

* Split Revision and Version enum values by newlines

Per code review request

* Convert C header generator driver to Python3

* Fix README for Python3 for extinst header generation

* Use 4-space in generated headers, consistently

Also update the README to show use of 1.1 SPIR-V headers
with 1.0 extended instruction sets.

Include all the headers.

Include the XML registry file, spir-v.xml, since it's also machine-readable
and potentially useful to programs.