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This also fixes backend/sign_bit.c

This needed some rewriting as ia32 previously checked already
transformed nodes while sparc was checking nodes before transformation.
Change ia32 to check nodes before transformation too. Also improved some
code in sparc+ia32.

Also add a GRAPH_PROPERTY for the analysis state.

graph_properties are things that a transformation may destroy but which
can be easily recalculated.

graph_constraints are set after lowering phases have been running and
forbid certain constructs that no (later) transformation is allowed to construct

This also plugs liveness related memory leaks

The opcode list was a member of irprog before which wasn't really
handled consistently. Also make sure opcodes are properly freed at
ir_finish().

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

[r28127]

[r28037]

[r28020]

[r27968]

[r27944]

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]

[r27727]

[r27720]

change betranshelp semantic to panic instead of duplicating node in case of missing transformer. Add generic API for setting transformers

[r27712]

[r27693]

[r27690]

[r27460]

invalidate phase info before starting the code selection; temporary disable freeing of old phases in dead code elimination to avoid problems

[r27309]

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

[r27285]

- remove a bunch of code which unexpectedly dependent on current_ir_graph being
  set to something
- fix unnecessary double creation of backedge arrays in some cases

[r27265]