Unify range_operators to one class.

Unify range_operators to one class.

Range_operator and range_operator_float are 2 different classes, making
generalized dispatch difficult.  The distinction between what is a float
operator and what is an integral operator also blurs when some methods
have multiple types.  ie, casts : INT = FLOAT and FLOAT = INT

This patch unifies all possible invocation patterns in one class, and
switches the float table to use the general range_op_table.

	* gimple-range-op.cc (cfn_constant_float_p): Change base class.
	(cfn_pass_through_arg1): Adjust using statemenmt.
	(cfn_signbit): Change base class, adjust using statement.
	(cfn_copysign): Ditto.
	(cfn_sqrt): Ditto.
	(cfn_sincos): Ditto.
	* range-op-float.cc (fold_range): Change class to range_operator.
	(rv_fold): Ditto.
	(op1_range): Ditto
	(op2_range): Ditto
	(lhs_op1_relation): Ditto.
	(lhs_op2_relation): Ditto.
	(op1_op2_relation): Ditto.
	(foperator_*): Ditto.
	(class float_table): New.  Inherit from range_op_table.
	(floating_tree_table) Change to range_op_table pointer.
	(class floating_op_table): Delete.
	* range-op.cc (operator_equal): Adjust using statement.
	(operator_not_equal): Ditto.
	(operator_lt, operator_le, operator_gt, operator_ge): Ditto.
	(operator_minus, operator_cast): Ditto.
	(operator_bitwise_and, pointer_plus_operator): Ditto.
	(get_float_handle): Change return type.
	* range-op.h (range_operator_float): Delete.  Relocate all methods
	into class range_operator.
	(range_op_handler::m_float): Change type to range_operator.
	(floating_op_table): Delete.
	(floating_tree_table): Change type.