[LSR] Fix incorrect comment. NFC (#79207)

Author: topperc

llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp

@@ -7017,7 +7017,7 @@ static bool ReduceLoopStrength(Loop *L, IVUsers &IU, ScalarEvolution &SE,
       assert(Expander.isSafeToExpand(TermValueS) &&
              "Terminating value was checked safe in canFoldTerminatingCondition");
 
-      // Create new terminating value at loop header
+      // Create new terminating value at loop preheader
       Value *TermValue = Expander.expandCodeFor(TermValueS, ToHelpFold->getType(),
                                                 LoopPreheader->getTerminator());