Fix typos found by http://github.com/lyda/misspell-check

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp b/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp
index 66a00e1..2468f0b 100644
--- a/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp
+++ b/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp
@@ -1,4 +1,4 @@
-//===- HexagonRemoveExtendArgs.cpp - Remove unecessary argument sign extends =//
+//===- HexagonRemoveExtendArgs.cpp - Remove unnecessary argument sign extends //
 //
 //                     The LLVM Compiler Infrastructure
 //