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

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!

Now we can distinguish from reg to mem (AMD64_OP_ADDR_REG) and from mem to reg (AMD64_OP_REG_ADDR) operations.

- Rename other_same field to should_be_same.
- Remove arch_register_req_type_other_same, it's enough to see if the
  should_be_same field is not zero.

Otherwise we end up with an add without in requirements.

* No \n at end; panic() adds one
* No punctuation mark at end
* Lowercase first letter

This is in preparation for a removal of the generic arch_irn_flag_modify_flags

Didn't notice this before because gcc doesn't report a warning for this,
clang does.

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.