Improve options printed on vectorization analysis diagnostics.

Improve options printed on vectorization analysis diagnostics.

The LLVM patch changes the analysis diagnostics produced when loops with
floating-point recurrences or memory operations are identified. The new messages
say "cannot prove it is safe to reorder * operations; allow reordering by
specifying #pragma clang loop vectorize(enable)". Depending on the type of
diagnostic the message will include additional options such as ffast-math or
__restrict__.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@246189 91177308-0d34-0410-b5e6-96231b3b80d8