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When a region header is part of a loop, then all entering edges of this region should not come from the loop but outside the region. Otherwise, the loop may be only partially part of the region, which would cause troubles in handling induction variables. Currently, we can only model induction variables that are either fully part of the scop (loop induction variable) or induction variables that are scop- invariant (parameter). A loop that is only partially part of the scop causes troubles, as there is no good way to handle the induction variable in the independent blocks pass. Contributed-by: Star Tan <tanmx_star@yeah.net> llvm-svn: 183800