[gomp4] tile pre patch

[Nathan Sidwell]

I've committed this to gomp4.  It gets a few tile-related things out of the way.

1) we were asserting we never saw tile clauses in a few places.  That'll change 
soon, and the processing required of them is nothing, so just accept them.  We 
don't need to gimplify the operands, as they have to be INTEGER_CSTs

2) Broke out OACC_DIM_{SIZE,POS} internal function generation to a worker 
function, as I need that soon.

3) Remvoe a stale comment and note OACC_DIM_POS's non-constness might be overly 
conservative.

nathan
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