Fix typo in comment.

llvm-svn: 220098
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 2dbbbc3..f5a399a 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -2217,7 +2217,7 @@
     llvm::SmallVector<ValueDecl*, 4> DeclsToRemove;
     // If non-null, add a note to the warning pointing back to the constructor.
     const CXXConstructorDecl *Constructor = nullptr;
-    // Varaibles to hold state when processing an initializer list.  When
+    // Variables to hold state when processing an initializer list.  When
     // InitList is true, special case initialization of FieldDecls matching
     // InitListFieldDecl.
     bool InitList = false;