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* tree-vrp.c (get_single_symbol): New function. (build_symbolic_expr): Likewise. (symbolic_range_based_on_p): New predicate. (extract_range_from_binary_expr_1): Deal with single-symbolic ranges for PLUS and MINUS. Do not drop symbolic ranges at the end. (extract_range_from_binary_expr): Try harder for PLUS and MINUS if operand is symbolic and based on the other operand. From-SVN: r215697
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