- Use this function in bespill.c, simplifies it and fixes some bugs
- Renamed the misleading is_mem_phi to is_spilled_phi
- Fixed bug where the morgan spiller was invoking the belady spiller without resetting the is_spilled_phi function

Fixed MST
Garbage collection of dead functions still necessary

blocks or loops). Other small changes:

* Added some verify functions that check for register pressure or valid schedules (replaces the broken check_pressure in bechordal_main.c)
* Some style/readability improvements to the belady spill code
* Some style/readability improvements to beuses.*
* Fixed registerpressure stat dumper
* Some improvements to bespill.c: When spilling already reloaded values, don't add a 2nd spill.

memory operands

return new flags

fixed psi conversion