- some code cleanup
- avoids the case where 2 dumpers are registered

- save ir_node* instead of irn_idx in the map (saves irn_idx_map
  lookups)
- in liveness_transfer check register class on the inputs (which is
  cheaper) and only then check the operand

The operation we want to perform is to get the live values just before a node.

This also plugs liveness related memory leaks

[r28127]

[r28030]

[r27924]

cleanup irphase: phase_reinit is a special case and doesn't polute the main callback interface anymore

[r27709]

[r27547]

[r27348]

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

[r27285]

[r27277]

[r27153]

[r27145]

keep timer interface simple - no names and descriptions for timers anymore, you should do that bookkeeping externally

[r26821]

[r26317]

[r25898]

- removed LV_COMPUTE_SORTED define and associated qsort(): nodes are now always sorted by construction, no need to sort them
- reduced parameters in recursion, placed constant values on a global struct

[r23691]

[r23614]

[r23613]

[r22889]