[PATCH] PR78346 make <bits/predefined_ops.h> handle stashing iterators

[Jonathan Wakely]

I didn't get an answer explaining why these function objects store a
reference not the iterator, so I'm fixing the regression by storing
the iterator and dereferencing it on every comparison.

	PR libstdc++/78346
	* include/bits/predefined_ops.h (_Iter_equals_iter): Store iterator
	not its referent.
	(_Iter_comp_to_iter): Likewise.
	* testsuite/25_algorithms/search/78346.cc: New test.

Tested powerpc64le-linux, committed to trunk, gcc-6-branch and gcc-5-branch.


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