nir/spirv: handle kernel function parameters

the idea here is to generate an entry point stub function wrapping around the
actual kernel function and turn all parameters into shader inputs with byte
addressing instead of vec4.

This gives us several advantages:
1. calling kernel functions doesn't differ from calling any other function
2. CL inputs match uniforms in most ways and we can just take advantage of most
   of nir_lower_io

v2: move code into a seperate function
v3: verify the entry point got a name
    fix minor typo
v4: make vtn_emit_kernel_entry_point_wrapper take the old entry point as an arg

Signed-off-by: Karol Herbst <[email protected]>

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