The (parallel) loop ID metadata was changed to a generic loop id llvm.loop
in LLVM 3.4(svn). Now parallel loops are detected again by the loop vectorizer.
Make the example1 amenable for parallel loop vectorization so it can
be used as a "smoke test" for the autovectorization.
Use standard LLVM optimizations when using the 'loopvec' method.
The loop vectorizer (and the SLP vectorizer) are on by default
when using -O3. The defaults should be always the best in their
set of preceeding loop transformations etc.
Remove references to llvm-ar and llvm-ranlib as the bitcode archive support is removed.