- Refactored finish/after_ra phases a bit, stacknode fixup and stack bias

- Refactored finish/after_ra phases a bit, stacknode fixup and stack bias
  walking occurs before finish phase now
- changed ia32 to do some things transforms from finish phase in after_ra phase
  already but do peephole optimization in finish phase.
- Added a peephole optimisation that transform IncSP,Store cascades to
  Pushs
- Replaced several HASH_PTR with nodeset_hash to make compiler more
  deterministic.