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It is unused.

This fixes backend/f2ull.c.

* 'get_atomic_ent_value()' is a wrapper, which tries to unify the different kind of initalizers by wastefully creating nodes on demand.
  It had only a single user, which tried to use it for method entities, which does not work anymore (see 3rd bullet point).
* 'set_atomic_ent_value()' is a thin and unnecessary wrapper to set a const node initializer.
* 'is_atomic_entity()' classifies entities having (among primitive and pointer types) method type as having an atomic initializer.
  They do not for a long time (was an address of itself).
  Except for the two functions above, this function is unused.
* 'Atomic' is a misnomer and should rather be 'scalar'.

The pointer modes must be identical now.

If a Sub has pointer mode, then the left operand has pointer mode, too.

This fixes opt/proc_cloning007.c.

This fixes opt/proc_cloning004.c, opt/proc_cloning005.c, opt/proc_cloning006.c.

This detects missed adjustments of frame Members in proc_cloning early.