ia32: Remove the parameter immediate_constraint_type, which is always 0, from create_immediate_or_transform().

sched_get_time_step() checks the same.

beverify: Simply use the register, which we already have, instead of fetching it again via its global index.

A comments starts with '#'.

It is impossible for a node in the schedule to be a Proj or not be scheduled.

Nobody should ask Projs for arch_irn_flags_t.

The test simply makes no sense.

It is hardly able to catch problems, because most arrays contain pointers.

n is produced by Id-skipping functions, so cannot be an Id node.

bearch: Use arch_register_req_is(req, ignore) instead of arch_irn_is_ignore(...), if we use the register requirements multiple times.

Projs are always in the same block as their predecessor.

sched_get_time_step() checks the same.

make it more robust and remove unnecessary req check

This also corrects dumping schedule edges.

- split edges_notify_edge into add/del/modify and call the correct
  function where we know which is needed
- get rid of some unnecessary flags so the ir_edge_t struct is smaller

- save ir_node* instead of irn_idx in the map (saves irn_idx_map
  lookups)
- in liveness_transfer check register class on the inputs (which is
  cheaper) and only then check the operand