[r13508]

[r13413]

- more work on state registers for x87 fpu rounding modes

- Replace limit callback in register requirements with a simple bitset
- Fix backends, generators and the rest of the code for the change register
  requirements structure
- Eliminated the custom register_requirement structures in the backend, they
  are pointless now, use the normal arch_register_req_t
- Fix TEMPLATE backend
- Extract emitter framework from ia32 and provide generic header/code for it
- Port TEMPLATE backend to new emitter
- Extract gas specific emit stuff (declarations, sections) from ia32 backend
  and provide it as generic header/code. Make TEMPLATE backend use that
- Remove several FIRM_DBG_REGISTERs from functions which are called very often.
  Before we had millions of string hashtable lookups because of that. The
  prefered way is to have 1 static debug module per file and initialize it in
  the module constructor. No passing around in environment structs and in no
  case should you dynamically register it in single functions.

- No #ifdef WITH_LIBCORE anymore in backend, compilation without libcore was broken anyway so we always require it now
- changed some #include "config.h" to the recommended #include <config.h>

- New register allocator modules can register themselfes in a list now,
	the same will be done for spillers, copy coalescers, architectures soon

- Fixes for compilation without DEBUG_libfirm
- Fixed for compilation without WITH_LIBCORE (but it's still broken)

- refactored backend to store some analysis info about the irg in the be_irg structure, added assure_ and invalidate_ functions for this

made code more firm style :)

added comments (especially for endif)

warning removed

  both try to transform as many jumps as possible to fallthroughs (weighted by
  execution frequency). The results are most of the times better than the extbb
  blockscheduler.
  Though it seems like x86 branch prediction sees conditional backward
  jumps as always taken, so we have to make sure that for 50/50 jumps we don't
  create backward jumps. (nothing implemented for this yet)