re PR tree-optimization/41987 (expected class ‘constant’, have ‘binary’ (rdiv_expr) in build_complex, at tree.c:1485)

	PR tree-optimization/41987
	* fold-const.c (const_binop): Avoid using fold_buildN().

testsuite:
	* gcc.c-torture/compile/pr41987.c: New.

From-SVN: r154065