We query liveness from the irg on demand now.

Move the values interfere function to belive.h, move the inline
implementation into belive.c

It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

When the loop ends normally, they would cause a double-free if NDEBUG.

Each copyopt algorithm recalculated the set of admissible colours, which bechordal already did.

A register requirement knows its class.
There is no need to take a detour over the copyopt environment.

copy_opt_t already has the irg, no need to fetch the chordal_env_t first.

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

Let list_for_each_entry(), list_for_each_entry_reverse() and list_for_each_entry_safe() declare their iterator variables.

Moves code from ifg dot-file dumpers around and produces .vcg graphs
now (ycomp layout is way better than xdot)

The new interface uses no complicated callbacks anymore, but is a simple
ir_node* -> void* nodemap. Adapted all users of ir_phase for this.

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)

[r28221]

Note that this is an ugly change because ALL index variables used inside
bitset_foreach() MUST be switched to size_t now, or the magical

elm != (size_t) -1;

will fail :-(

[r28199]

[r28127]