[libcxx][test] Construct non-empty containers in iterator's debug mode tests

The debug mode tests for map/set's iterators construct empty
containers, making the code after the first increment meaningless.
It's never executed since the tests exit earlier.

It doesn't seem to be intentional, so the patch makes the tests
to construct containers that include at least one element.

Reviewed By: curdeius, Quuxplusone

Differential Revision: https://reviews.llvm.org/D100029

GitOrigin-RevId: 4a292eda25bc999ec175f0d21b87cb0225b6da86
12 files changed