Revert "[Polly] Reject reject regions entered by an indirectbr/callbr."

This reverts commit 91f46bb77e6d56955c3b96e9e844ae6a251c41e9 which
causes test failures when assertions are off.

GitOrigin-RevId: 283ed7de323b9fd73939155ff1f3630e5363f99c
4 files changed