nir: Rematerialize derefs after opt_dead_cf

nir: Rematerialize derefs after opt_dead_cf

Adding `nir_rematerialize_derefs_in_use_blocks_impl`
solves some cases when 'opt_dead_cf()' generates
a phi instruction for the first argument
of the `deref_store` intrinsic.

Signed-off-by: Mykhailo Skorokhodov <mykhailo.skorokhodov@globallogic.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Lionel Landwerlin's avatarLionel Landwerlin <lionel.g.landwerlin@intel.com>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/6742
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22983>