(Backend C) Add fifo vectorization when possible
(Backend C) Bug fixes on fifo vectorization
(Backend C) First working version of fifo vectorization
(C) Change min repeat size used for vectorization
(C) Fifo vectorization : help compilers to vectorize some loops
(C) Vectorization refactoring : new util class to manage "vectorizable" attributs
(Backends) Vectorizable optimization : determine statically actions that can always been vectorized
(C) More optimizations for vectorizable fifo
Merge branch 'master' of ssh://github.com/orcc/orcc

Adding fifo optimizations to allow vectorization by compilers.