[IRSim][NFC] Removing dead variables from IRSimilarityIdentifier.cpp

As informed by danielkiss.

Follow up to Differential Revision: https://reviews.llvm.org/D86972

Author: AndrewLitteken

llvm/lib/Analysis/IRSimilarityIdentifier.cpp

@@ -466,8 +466,6 @@ static void createCandidatesFromSuffixTree(
     std::vector<IRSimilarityCandidate> &CandsForRepSubstring) {
 
   unsigned StringLen = RS.Length;
-  unsigned NumFound = 0;
-  unsigned PreviousIdx = 0;
 
   // Create an IRSimilarityCandidate for instance of this subsequence \p RS.
   for (const unsigned &StartIdx : RS.StartIndices) {
@@ -488,9 +486,6 @@ static void createCandidatesFromSuffixTree(
     if (ContainsIllegal)
       continue;
 
-    PreviousIdx = EndIdx;
-    NumFound++;
-
     // We are getting iterators to the instructions in this region of code
     // by advancing the start and end indices from the start of the
     // InstrList.