Don't look for __builtin_ffs, we'll never see it from llvm-gcc and there's

} FFSLLOptimizer;

/// This LibCallOptimization will simplify calls to the "__builtin_ffs" 

/// function which is generated by the CFE (its GCC specific). 

/// It simply uses FFSOptimization for which the transformation is

/// identical.

/// @brief Simplify the ffsl library function.

struct BuiltinFFSOptimization : public FFSOptimization

{

public:

  /// @brief Default Constructor

  BuiltinFFSOptimization() : FFSOptimization("__builtin_ffs",

      "Number of '__builtin_ffs' calls simplified") {}

} BuiltinFFSOptimization;

/// A function to compute the length of a null-terminated constant array of

/// integers.  This function can't rely on the size of the constant array 

/// because there could be a null terminator in the middle of the array.