This fixes opt/fehler070.c on ARM.

They just use a 12 bit offset, not an immediate shifter operand.
This fixes the regression in ack/str.c.

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

eliminate the unnecessary and especially confusing concept of a 'code_generator' an isa-interface is enough

[r28009]

[r27730]

  (with different arguments and register constraints for the same node now)
- Lots of cleanups/changes in the arm backend. We can represent all
  "shifter operands" now (but the code selection isn't optimal yet)
- More fixes all over the place - arm backend handles 164.gzip now

[r26673]

[r19823]

[r17143]

[r16212]

rename peephole optimisation function

[r16057]

[r13629]

unified .h include guards
fixed include structure (every files includes needed headers)

[r13560]

[r13508]

  walking occurs before finish phase now
- changed ia32 to do some things transforms from finish phase in after_ra phase
  already but do peephole optimization in finish phase.
- Added a peephole optimisation that transform IncSP,Store cascades to
  Pushs
- Replaced several HASH_PTR with nodeset_hash to make compiler more
  deterministic.

  - separated constant placement and reference mode changes
  - place constants now in "optimal" block (smallest user dominator)
removed some unused variables

extended dumper
adapted to bearch interface changes

removed some unused variables
added optimization to move Const's from start block into the block where they are used