Major new features:
      * AddressSanitizer, a fast memory error detector.
      * MachineInstr Bundles, Support to model instruction 
        bundling / packing.
      * ARM Integrated Assembler, A full featured assembler 
        and direct-to-object support for ARM.
      * Basic Block Placement Probability driven basic block placement.
  
  LLVM IR and Core Improvements
     
      * IR support for half float
      * IR support for vectors of pointers, including vector GEPs.
      * Module flags have been introduced.
      * Loads can now have range metadata attached to them to 
        describe the possible values being loaded. 
      * Inline cost heuristics have been completely overhauled 
        and now closely model constant propagation through call sites, 
        disregard trivially dead code costs, and 
        can model C++ STL iterator patterns.
   
  Optimizer Improvements
      * The loop unroll pass now is able to unroll loops with 
        run-time trip counts. This feature is turned off by default, 
        and is enabled with the -unroll-runtime flag.
      * A new basic-block autovectorization pass is available. 
        Pass -vectorize to run this pass along with some associated 
        post-vectorization cleanup passes. 
   X86-32 and X86-64 Target Improvements
      * Bug fixes and improved support for AVX1
      * Support for AVX2 (still incomplete at this point)

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