This fixes opt/fehler240.c.

This fixes opt/fehler241.c.

This is necessary for ia32 calling conventions for complex float numbers.

Adapt indentation/brace style to rest of libfirm.

If a load/store has a compiler generated entity as address, then we can
be sure that they won't produce null-pointer exceptions so we can move
them around.

The bug didn't affect any existing code, but the fix is necessary for code I am
working on.

Rework load memory chain walking:
- We keep the pointer as a base + offset representation all the time
- Reuse predict_load code from localopt for more accurate replacement of
  Loads from constant entities
- Support some more cases where load-after-load and load-after-store did
  not use the same mode but where we can easily get the value with some
  arithmetic.

This fixes opt/loadstore6.c.

This fixes opt/fehler238.c.