[gomp4] Redesign oacc_parallel launch API

[Nathan Sidwell]

On 08/06/15 18:33, Cesar Philippidis wrote:

> Looking at set_oacc_fn_attrib, it appears that const values are also
> considered dynamic. See the attached test case more more info. Is that
> the expected behavior? If not, I could take a look at this after I
> finished my reduction patch.

It's annoying that the offload  call is happening too early for that kind of 
constant propagation.  But I guess it might have been propagated by the time we 
get to oacc_xform.  And hence that could optimize there.

Anyway, a thing to notice but not get distracted by.

nathan