[DA] Clean up unnecessary member function declarations (#170106)

Follow-up for #169047. The previous PR moved some functions from DA to
Delinearization, but the member function declarations were not updated
accordingly. This patch removes them.

Author: kasuga-fj

llvm/include/llvm/Analysis/DependenceAnalysis.h

@@ -506,17 +506,6 @@ class DependenceInfo {
   bool isKnownPredicate(ICmpInst::Predicate Pred, const SCEV *X,
                         const SCEV *Y) const;
 
-  /// isKnownLessThan - Compare to see if S is less than Size
-  /// Another wrapper for isKnownNegative(S - max(Size, 1)) with some extra
-  /// checking if S is an AddRec and we can prove lessthan using the loop
-  /// bounds.
-  bool isKnownLessThan(const SCEV *S, const SCEV *Size) const;
-
-  /// isKnownNonNegative - Compare to see if S is known not to be negative
-  /// Uses the fact that S comes from Ptr, which may be an inbound GEP,
-  /// Proving there is no wrapping going on.
-  bool isKnownNonNegative(const SCEV *S, const Value *Ptr) const;
-
   /// collectUpperBound - All subscripts are the same type (on my machine,
   /// an i64). The loop bound may be a smaller type. collectUpperBound
   /// find the bound, if available, and zero extends it to the Type T.