fix typos

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@47995 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Analysis/DeadStores.cpp b/Analysis/DeadStores.cpp
index 4475d49..0c05484 100644
--- a/Analysis/DeadStores.cpp
+++ b/Analysis/DeadStores.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This files defines a DeadStores, a flow-sensitive checker that looks for
+//  This file defines a DeadStores, a flow-sensitive checker that looks for
 //  stores to variables that are no longer live.
 //
 //===----------------------------------------------------------------------===//