[PATCH] Fix maxLoopDepth computation in ScopInfo

[David Peixotto]

Tobi,

I added a test case and also an explanation in the commit message on when we can hit this problem.

These scops occur when a region containing an inner loop is expanded
to include some blocks from the outer loop, but it cannot be fully
expanded to contain the outer loop because the region containing the
outer loop is invalid.


http://reviews.llvm.org/D6913

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