(otherwise CSE merges temporary Phi nodes without inputs)

One of the green things on plants is a 'leaf'.
A 'leave', would be a vacation.

For the plural of 'leaf', 'leaves' is more common,
but 'leafs' is also correct and more regular.

This fixes the case where the stackframe size is not a multiple of the
alignment.

(or multiple ir_init/ir_finishs will fail)

The panic function might allocate memory via ir_vfprintf, so we must
not use it in the out of memory case.  Otherwise we get an infinite loop.

Improvements:
- added support for -march=atom
- fixed some assignments of incompatible enum types
- simplified code

This also plugs liveness related memory leaks

Types "own" entities, so they should also free them when they get freed.

It was a member of ir_prog before but not correctly handled.

The first block in a new ir_graph is not an immature block anymore. The
end block is matured in irg_finalize_cons() now (since maturing blocks
twice doesn't hurt this shouldn't break existing code).

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().