This save quite a bit of code duplication.
Also the code drifted apart in the different backends, which this macro prevents now.

Only keep the basics necessary to emit text lines in beemitter.[ch] and
move all the other convenience stuff to beemithlp.[ch].

be: Factorise the code to emit an asm node and use a callback for each backend to output the operands.

All backends emit nothing for Phis and be_Keeps, so set this centrally.

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

beemit: Provide be_emit_node(), which merges the (almost) identical node emit functions of the backends.

Also use one common be_emit_nothing().

[r28062]

[r26080]

[r23690]

[r23688]

[r23687]

[r22889]

[r22724]

[r17143]

[r15927]

[r15280]

[r14955]

[r14629]

[r14604]

[r13656]

[r13585]

[r13572]

unified .h #ifndef ... #define ...
changed some indenting
removed some unused code
removed beuses_t.h as unused header

[r13559]

[r13508]

[r13493]

- 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.