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be: Pass the input requirements directly to the constructors of nodes, which have a variable number of arguments.

All backends had identical implementations.
Now rematerialization works out of the box for new backends.

All backends have similar empty Start nodes, which just provide registers.
So having one generic backend Start node to share some infrastructure is sensible.

It is like new_r_Proj(), but the mode is determined automatically from the out requirement of the predecessor.
This probably resolves some mode mismatches in untested code paths -- AMD64 backend and SPARC hard float, I'm looking at you!

This node will be used as a helper for PIC lowering passes which want to
force a specific relocation getting used for an entities address.

be: Add the function arch_copy_irn_out_info() to copy one requirement and register from another node.

* This avoids allocating new requirements.
* This renders be_set_constr_single_reg_out() obsolete.

Now the number of outputs is adjusted, too.
This did not cause any problems, because the Perm is lowered right afterwards.

All users construct their Keeps in one go.

It was only used in one place, where it is easily replaced.

This replaces ia32_ProduceVal/arm_EmptyReg. You should avoid using this
node in general, but there are some cases where you need it to fixup
nodes that are not register pressure faithful.

- alignment is set on each single IncSP now instead of a global arch_env
  setting
- fixed ia32 not requesting any alignment anymore (even on darwin where
  we need it)
- fixed amd64 creating IncSP nodes without flag_modifies_flags set