libstdc++: Add always_inline to trivial iterator operations

libstdc++-v3/ChangeLog:

	* include/bits/stl_iterator_base_funcs.h (__distance):
	Add always_inline attribute to overload for random
	access iterators.
	(advance, distance, next, prev): Add always_inline attribute to
	inline functions that just forward to another function.
1 file changed