spirv: Change spirv_to_nir() to return a nir_shader

spirv: Change spirv_to_nir() to return a nir_shader

spirv_to_nir() returned the nir_function corresponding to the
entrypoint, as a way to identify it.  There's now a bool is_entrypoint
in nir_function and also a helper function to get the entry_point from
a nir_shader.

The return type reflects better what the function name suggests.  It
also helps drivers avoid the mistake of reusing internal shader
references after running NIR_PASS on it.  When using NIR_TEST_CLONE or
NIR_TEST_SERIALIZE, those would be invalidated right in the first pass
executed.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>