drop pet_scop_detect_parameter_accesses

drop pet_scop_detect_parameter_accesses

In the previous commit, we changed pet_context_evaluate_expr to plug in
affine expressions for scalar reads.  This means in particular that
pet_context_evaluate_expr will plug in parameters for reads to
accesses to the corresponding variable.  There is therefore no longer
any need for pet_scop_detect_parameter_accesses to look for such reads
at the end of the scop construction as they will already have been
handled by pet_context_evaluate_expr during the scop construction.

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>