[DA] Remove dead code from the Weak Crossing SIV test (#190355)

The ConstantRange intersection check can now handle cases where the
condition of this branch is satisfied. The check is performed before
entering this function, so this part is no longer necessary.

llvm/lib/Analysis/DependenceAnalysis.cpp

@@ -1402,17 +1402,6 @@ bool DependenceInfo::weakCrossingSIVtest(const SCEVAddRecExpr *Src,
   if (!ConstDelta)
     return false;
 
-  // We're certain that ConstCoeff > 0; therefore,
-  // if Delta < 0, then no dependence.
-  LLVM_DEBUG(dbgs() << "\t    Delta = " << *Delta << "\n");
-  LLVM_DEBUG(dbgs() << "\t    ConstCoeff = " << *ConstCoeff << "\n");
-  if (SE->isKnownNegative(Delta)) {
-    // No dependence, Delta < 0
-    ++WeakCrossingSIVindependence;
-    ++WeakCrossingSIVsuccesses;
-    return true;
-  }
-
   ConstantRange SrcRange = SE->getSignedRange(Src);
   ConstantRange DstRange = SE->getSignedRange(Dst);
   LLVM_DEBUG(dbgs() << "\t    SrcRange = " << SrcRange << "\n");