Fix some libstdc++ testsuite failures

Fix some libstdc++ testsuite failures

	* testsuite/20_util/function_objects/comparisons_pointer.cc: Use
	VERIFY instead of assert.
	* testsuite/20_util/hash/84998.cc: New test.
	* testsuite/23_containers/vector/cons/destructible_debug_neg.cc: New
	copy of test adjusted for Debug Mode.
	* testsuite/23_containers/vector/cons/destructible_neg.cc: Do not run
	test in Debug Mode.

From-SVN: r258714