arb_gl_spirv: add calls to several nir lowerings

For now we are just adding nir lowerings that are needed/mandatory to
get things working. After everything is settled, we would start to add
good-to-have lowerings.

This patch adds the following calls:

  * nir_split_var_copits and nir_split_per_member_structs: as vulkan
    drivers are doing now. See commit
    b0c643d8f579a3e1e45a08f6d9de099f2c45898b ("spirv: Use NIR
    per-member splitting") for more info.

    Without this commit, piglit tests like this crashes:
    spec/arb_gl_spirv/execution/varying/block

    And in general most of the shaders that includes any kind of
    struct.

   * nir_copy_prop: after nir_deref_instr introduction, function calls
    need this. See commit "nir,spirv: Rework function calls"
    (c11833ab24dcba26de1b0a5805e35a5d6761514e) for more info.

Reviewed-by: Timothy Arceri <[email protected]>

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