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This patch adds a new option to CriticalEdgeSplittingOptions to control whether loop-simplify form must be preserved. It is them used by GVN to indicate that loop-simplify form does not have to be preserved. This fixes a crash exposed by 189efe295b6e. If the critical edge we are splitting goes from a block inside a loop to a block outside the loop, splitting the edge will create a new exit block. As a result, the new block will branch to the original exit block, which will add a non-loop predecessor, breaking loop-simplify form. To preserve loop-simplify form, the predecessor blocks of the original exit are split, but that does not work for blocks with indirectbr terminators. If preserving loop-simplify form is requested, bail out , before making any changes. Reviewers: reames, hfinkel, davide, efriedma Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D81582
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