Index: lib/Transforms/Vectorize/LoopVectorize.cpp
===================================================================
--- lib/Transforms/Vectorize/LoopVectorize.cpp
+++ lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -1842,9 +1842,6 @@
 
     /// Holds the maximum number of concurrent live intervals in the loop.
     unsigned MaxLocalUsers;
-
-    /// Holds the number of instructions in the loop.
-    unsigned NumInstructions;
   };
 
   /// \return Returns information about the register usages of the loop for the
@@ -6307,7 +6304,6 @@
   // We divide by these constants so assume that we have at least one
   // instruction that uses at least one register.
   R.MaxLocalUsers = std::max(R.MaxLocalUsers, 1U);
-  R.NumInstructions = std::max(R.NumInstructions, 1U);
 
   // We calculate the interleave count using the following formula.
   // Subtract the number of loop invariants from the number of available
@@ -6434,7 +6430,6 @@
   DFS.perform(LI);
 
   RegisterUsage RU;
-  RU.NumInstructions = 0;
 
   // Each 'key' in the map opens a new interval. The values
   // of the map are the index of the 'last seen' usage of the
@@ -6453,7 +6448,6 @@
 
   unsigned Index = 0;
   for (BasicBlock *BB : make_range(DFS.beginRPO(), DFS.endRPO())) {
-    RU.NumInstructions += BB->size();
     for (Instruction &I : *BB) {
       IdxToInstr[Index++] = &I;
 
@@ -6563,7 +6557,6 @@
     DEBUG(dbgs() << "LV(REG): VF = " << VFs[i] << '\n');
     DEBUG(dbgs() << "LV(REG): Found max usage: " << MaxUsages[i] << '\n');
     DEBUG(dbgs() << "LV(REG): Found invariant usage: " << Invariant << '\n');
-    DEBUG(dbgs() << "LV(REG): LoopSize: " << RU.NumInstructions << '\n');
 
     RU.LoopInvariantRegs = Invariant;
     RU.MaxLocalUsers = MaxUsages[i];