comment typo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153462 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 60b7e62..f211244 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -2441,7 +2441,7 @@
     if (!isCompatibleIVType(PrevIV, NextIV))
       continue;
 
-    // A phi nodes terminates a chain.
+    // A phi node terminates a chain.
     if (isa<PHINode>(UserInst)
         && isa<PHINode>(IVChainVec[ChainIdx].back().UserInst))
       continue;