function resolve( dtype, policy ) {
	return outputDataType( [ dtype ], policy );
}
Resolves the output ndarray data type for a unary function.

@param {string} dtype - input ndarray data type
@param {string} policy - output ndarray data type policy
@throws {TypeError} second argument must be a recognized data type policy
@returns {string} output ndarray data type

@example
var dt = resolve( 'float64', 'complex_floating_point' );
// returns <string>