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* tree-ssa-ifcombine.c (forwarder_block_to): New function. (tree_ssa_ifcombine_bb_1): New function. (tree_ssa_ifcombine_bb): Use it. Handle also cases where else_bb is an empty forwarder block to then_bb or vice versa and then_bb and else_bb are effectively swapped. * gcc.dg/tree-ssa/ssa-ifcombine-12.c: New test. * gcc.dg/tree-ssa/ssa-ifcombine-13.c: New test. * gcc.dg/tree-ssa/phi-opt-2.c: Pass -mbranch-cost=1 if possible, only test for exactly one if if -mbranch-cost=1 has been passed. From-SVN: r208512
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