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This tries to get the names in a consistent format. We basically have 2
views on register allocation/constraints now:

1) Register Requirements and Assigments are per-instruction. Each
   instruction has requirements on its inputs and outputs, register get
   assigned for outputs of an instruction (assignment is an attribute of
   an instruction, not of the Proj-nodes).
   The internal datastructures model this form!

   The functions here have the form:
     arch_get_irn_register_req_in(node, input_nr)
     arch_get_irn_register_in(node, input_nr)
     arch_get_irn_register_req_out(node, output_nr)
     arch_set_irn_register_out(node, output_nr, register)

2) Register Requirements and Assignments are on firm-values. This view
   allows to query/assign requirements and registers at the Proj nodes
   instead of the repsective predecessors.
   This is a convenience interface modeled on top of the other!

   The functions have the form:
     arch_get_irn_register_req(node)
     arch_get_irn_register(node)
     arch_set_irn_register(node, register)

(they are not represented in the firm schedule)

Only makes it hard to search for arch_register_type_* flags.

[r28185]

[r28127]

[r28071]

[r28039]

[r28010]

[r27924]

[r27910]

The gain from using an extra Unreachable is rather low, plus the noreturn call must probably be keeped anyway, so revrt it again

[r27898]

Unreachable nodes mark unreachable control flow (after noreturn calls). They
"eat" the memory, saving the two keeps used before.

Works mostly yet (scheduler issues warning about not scheduled Unreachable's)

[r27894]

[r27692]

[r27691]

[r27690]

remove arch_irn_class_is macro as it hides usages of arch_irn_class_XXX from grep, also remove useless safety checks against classify of Projs returning wrong values

[r27645]

- rework ir_phase API
(sorry for mixing these 2 things into 1 commit)

[r27285]

[r27195]

Some more cleanup: Put the return type and other specifiers on the same line as the declarator of a function declaration.

[r27155]

[r27153]

[r27145]

[r26621]

- Introduced be_Start which is now used instead of iro_Start+be_RegParams
- further cleanups and fixes along the way

[r26549]

	* benodes store the out register requirements in backend_info now
	  (this is work towards killing the register_requirement callbacks)
	* ir_graph has a pointer to beirg now
	* Other cleanups

[r26540]

[r26535]

[r26476]

[r26340]

[r26317]

[r26315]

[r26239]

[r23613]

	Node flags and node registers are stored in a generic backend_info struct now
	instead of every part of the backend doing custom (and slow) stuff

[r23142]