fix typo in comment

llvm-svn: 337480
diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index a58982b..e5e9cf6 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -3336,7 +3336,7 @@
 //   a reference to the TypeInfo for the type and a reference to the
 //   CompleteHierarchyDescriptor for the type.
 //
-// ClassHieararchyDescriptor: Contains information about a class hierarchy.
+// ClassHierarchyDescriptor: Contains information about a class hierarchy.
 //   Used during dynamic_cast to walk a class hierarchy.  References a base
 //   class array and the size of said array.
 //