Fix typo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201944 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/RegAllocBase.cpp

@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file defines the RegAllocBase class which provides comon functionality
+// This file defines the RegAllocBase class which provides common functionality
 // for LiveIntervalUnion-based register allocators.
 //
 //===----------------------------------------------------------------------===//