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* fold-const.c (int_const_binop): Return NULL_TREE when an expression can't be evaluated at compile-time (instead of calling abort). Return NULL_TREE for division (and modulus) by zero. (const_binop): Return NULL_TREE for floating point operators that aren't handled by real_arithmetic. (fold_binary): Eliminate "wins" variable, and "binary" label, by folding operators with constant operands early. Assert that operands are non-NULL. From-SVN: r109088
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