[LSR] Clarify a comment. NFC.

llvm-svn: 317295
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index bbb179d..7f03f23 100644
--- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1037,7 +1037,7 @@
   Value *OperandValToReplace = nullptr;
 
   /// If this user is to use the post-incremented value of an induction
-  /// variable, this variable is non-null and holds the loop associated with the
+  /// variable, this set is non-empty and holds the loops associated with the
   /// induction variable.
   PostIncLoopSet PostIncLoops;