[NFC][ScalarEvolution] Fix typo in getRangeForAffineAR and getRangeViaFactoring

  /// copied if its needed for longer.

  const ConstantRange &getRangeRef(const SCEV *S, RangeSignHint Hint);

  /// Determines the range for the affine SCEVAddRecExpr {\p Start,+,\p Stop}.

  /// Determines the range for the affine SCEVAddRecExpr {\p Start,+,\p Step}.

  /// Helper for \c getRange.

  ConstantRange getRangeForAffineAR(const SCEV *Start, const SCEV *Stop,

  ConstantRange getRangeForAffineAR(const SCEV *Start, const SCEV *Step,

                                    const SCEV *MaxBECount, unsigned BitWidth);

  /// Determines the range for the affine non-self-wrapping SCEVAddRecExpr {\p

  /// Start,+,\p Stop}<nw>.

  /// Start,+,\p Step}<nw>.

  ConstantRange getRangeForAffineNoSelfWrappingAR(const SCEVAddRecExpr *AddRec,

                                                  const SCEV *MaxBECount,

                                                  unsigned BitWidth,

                                                  RangeSignHint SignHint);

  /// Try to compute a range for the affine SCEVAddRecExpr {\p Start,+,\p

  /// Stop} by "factoring out" a ternary expression from the add recurrence.

  /// Step} by "factoring out" a ternary expression from the add recurrence.

  /// Helper called by \c getRange.

  ConstantRange getRangeViaFactoring(const SCEV *Start, const SCEV *Stop,

  ConstantRange getRangeViaFactoring(const SCEV *Start, const SCEV *Step,

                                     const SCEV *MaxBECount, unsigned BitWidth);

  /// If the unknown expression U corresponds to a simple recurrence, return