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* tree-cfg.c (tree_can_merge_blocks_p): Allow phi nodes in the merged block. (replace_uses_by): New function. (tree_merge_blocks): Eliminate the phi nodes in the merged block. * tree-flow.h (fold_stmt_inplace): Declare. * tree-ssa-ccp.c (fold_stmt_inplace): New function. * tree-ssa-dom.c (tree_ssa_dominator_optimize): Update dominance info after cfg cleanup. From-SVN: r99850
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