spirv: Implement OpTraceRayKHR and OpExecuteCallableKHR

spirv: Implement OpTraceRayKHR and OpExecuteCallableKHR

The old NV version (and the provisional KHR version) specified the data
payload via an integer location.  This was quite annoying for the parser
and potentially error-prone.  The final KHR version of the SPIR-V
ray-tracing spec replaces these integers with actual pointers.  We don't
really need to implement the NV versions but we have the code and
someone might want to parse some NV ray-tracing shaders.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7734>