Fix some warnings

	PR tree-optimization/110205
	* gimple-range-cache.h (ranger_cache::m_estimate): Delete.
	* range-op-mixed.h (operator_bitwise_xor::op1_op2_relation_effect):
	Add final override.
	* range-op.cc (operator_lshift): Add missing final overrides.
	(operator_rshift): Ditto.