[PATCH] support llvm.vectorization.vector_width metadata

[Redmond, Paul]

Hi,

The attached patch modifies LoopVectorizer to recognize llvm.vectorization.vector_width metadata attached to llvm.loop metadata.

The llvm.loop.parallel metadata has been renamed to llvm.loop to be more generic. Loop::isAnnotatedParallel now looks for llvm.loop and associated llvm.mem.parallel_loop_access. If we decide that we still need an explicit llvm.loop.parallel metadata then it can be added as a child of llvm.loop.

Loop::setLoopID was added for symmetry and it is used in a forthcoming patch which preserves llvm.loop metadata in loop passes.

paul

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