[LAA] Turn RuntimePointerChecking into a class, start hiding things, NFC

  bool couldPreventStoreLoadForward(unsigned Distance, unsigned TypeByteSize);

};

/// This struct holds information about the memory runtime legality check that

/// a group of pointers do not overlap.

struct RuntimePointerChecking {

/// \brief Holds information about the memory runtime legality checks to verify

/// that a group of pointers do not overlap.

class RuntimePointerChecking {

public:

  struct PointerInfo {

    /// Holds the pointer value that we need to check.

    TrackingVH<Value> PointerValue;

  void groupChecks(MemoryDepChecker::DepCandidates &DepCands,

                   bool UseDependencies);

  /// \brief Decide whether we need to issue a run-time check for pointer at

  /// index \p I and \p J to prove their independence.

  ///

  /// If \p PtrPartition is set, it contains the partition number for

  /// pointers (-1 if the pointer belongs to multiple partitions).  In this

  /// case omit checks between pointers belonging to the same partition.

  bool needsChecking(unsigned I, unsigned J,

                     const SmallVectorImpl<int> *PtrPartition) const;

  /// \brief Decide if we need to add a check between two groups of pointers,

  /// according to needsChecking.

  bool needsChecking(const CheckingPtrGroup &M, const CheckingPtrGroup &N,

  /// Holds a partitioning of pointers into "check groups".

  SmallVector<CheckingPtrGroup, 2> CheckingGroups;

private:

  /// \brief Decide whether we need to issue a run-time check for pointer at

  /// index \p I and \p J to prove their independence.

  ///

  /// If \p PtrPartition is set, it contains the partition number for

  /// pointers (-1 if the pointer belongs to multiple partitions).  In this

  /// case omit checks between pointers belonging to the same partition.

  bool needsChecking(unsigned I, unsigned J,

                     const SmallVectorImpl<int> *PtrPartition) const;

  /// Holds a pointer to the ScalarEvolution analysis.

  ScalarEvolution *SE;

};