[SYCL] Replace SPIR-V INTEL shuffles with generic version (#21416)
Replaced __spirv_SubgroupShuffleINTEL, __spirv_SubgroupShuffleXorINTEL,
__spirv_SubgroupShuffleDownINTEL and __spirv_SubgroupShuffleUpINT with
__spirv_GroupNonUniformShuffle... generic versions.
According to the [OpenCL
Specification](https://registry.khronos.org/OpenCL/specs/3.0-unified/html/OpenCL_Env.html#_cl_khr_subgroup_shuffle),
these operations only accept scalars, so we force vectorization of
vectors.
Additionally this provides a nativecpu implementation mimicking the
behavior of intel_subgroup's, only the subgroup scope has been
implemented.
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Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>
Co-authored-by: Alex Pim <alex.pim@imgtec.com>
Co-authored-by: Larsen, Steffen <steffen.larsen@intel.com>
