Fix typo in CastExpr::getCastKindName.

Patch by Mathieu Baudet!

llvm-svn: 200817
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index c921129..29b9fe2 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1602,7 +1602,7 @@
   case CK_ARCReclaimReturnedObject:
     return "ARCReclaimReturnedObject";
   case CK_ARCExtendBlockObject:
-    return "ARCCExtendBlockObject";
+    return "ARCExtendBlockObject";
   case CK_AtomicToNonAtomic:
     return "AtomicToNonAtomic";
   case CK_NonAtomicToAtomic: