[PATCH] Add optimization remarks to the loop unroller and vectorizer.

[hfinkel at anl.gov]

Good point, vectorized with VF == 1 is confusing. We should report the VF == 1 cases as just, 'unrolled with interleaving factor N'.

(We should also also say "interleave factor" or "unrolling interleave factor" in the regular case; we've decided to use the "interleave" terminology for the associated pragma).

http://reviews.llvm.org/D3456