Add a phase before coloring thats split all live variables before each instruction that defines a paired value.

- The direct call did not respect the get_opt_constant_folding() flag

the ident module shouldn't have name-mangling policies builtin.

Mangling logic should not be in the ident module, frontends should provide it
(there's also the compilerlib interface for it)

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

(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.