Retiring a couple of futures
Merge pull request #390 from vasslitvinov/retire-futures

Retiring a couple of futures.

From statements/bradc/loops/modifyIndices.future
[This future] was originally
filed as though this was a language-level decision; since then, we've
determined (wisely, I believe) that it should be a function of the
iterator's return intent [ref or not], not the language itself.

memory/vass/memleak-array-of-records-1.chpl
started succeeding recently for all configurations.
I am retiring it without investigating why.