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This flag is plain redundant.

Register outputs always need the mode of the register class involved.

Also adds a new INSN_MODE_INVALID for 0 to catch uninitialized values.

I found this neat trick in llvm output, and the existing code was broken
anyway.

There are still similar problems left.

Add callbacks on functions that really need them instead.

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

* It was retrieved from the arch_env before.
* Also rename be_abi_fix_stack_nodes() to be_fix_stack_nodes().

All other structs holding a register class call it cls, too.