[graphite] build_scops_conditions

[Tobias Grosser]

Hi graphities,

Adrien has written code to detect for every bb the conditions,
that restrict the execution of this code.

Example:

for (i = 0; i <= 20; i++)
  {
    A

    if (2i <= 8)
      B
  }

So for B there is a additional condition (2i <= 8).

At the moment, we just add the conditions to the gbbs, but I hope someone
will find the time, to add them to the domain matrix.

I would like to commit this code. Patch attached.

See you
Tobias
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