[polly] ICE with scev-codegen after removal of RegionSimplify

[Sebastian Pop]

Tobias Grosser wrote:
> We would need one patch that models scalar dependences in the polyhedral model
> and a second that introduces the allocs/loads/stores if it encounters scalar
> dependences during code generation.

Why would you need to generate things on the stack in codegen?  I think we
should be able to directly generate SSA ;-)

The whole point of going out of SSA for scalar dependences crossing BBs (going
out of scop, etc.) was to expose scalar deps to the dependence analysis.  Now
that we walk the further mile to represent scalar deps in the dependence graph,
we should be able to also produce much better scalar SSA code.

Sebastian
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