[SCEV] Fix typo. NFC.

Fix confusing typo in comment.

llvm-svn: 322765
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index d6f3b35..332c074 100644
--- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -937,7 +937,7 @@
   return true;
 }
 
-/// If any of the instructions is the specified set are trivially dead, delete
+/// If any of the instructions in the specified set are trivially dead, delete
 /// them and see if this makes any of their operands subsequently dead.
 static bool
 DeleteTriviallyDeadInstructions(SmallVectorImpl<WeakTrackingVH> &DeadInsts) {