- We now create a spill/reload/phi-web and take the largest necessary
  reload size to determine the size of the entities and the spills.
- Some cleanups

This mainly adds comments explaining the situation and avoids an extra
graph walk.

This works around a problem with modeling control flow for calls to
setjmp and similar functions.

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.

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

The only user knwos, where its sp is.

We can now pull instructions from other blocks up and use the annul bits
if profitable.

(This avoids effects where compilation fails because of an unused
 stackpointer)

We have to perform the stackframe-type alignment adjustments before we
set the immediates of the Save instruction are adjusted.

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().

before we only tested, if we produce an output that is used as as input
of any schedule node in between. This missed the case where you have
unscheduled utility nodes like Sync in between.