[libclang] Introduce CXCursor_CXXAccessSpecifier for C++'s public:/private:/protected: specifiers.

Patch by Paolo Capriotti!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140864 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index a812631..0f0ff85 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -3424,6 +3424,8 @@
     return createCXString("ObjCSynthesizeDecl");
   case CXCursor_ObjCDynamicDecl:
     return createCXString("ObjCDynamicDecl");
+  case CXCursor_CXXAccessSpecifier:
+    return createCXString("CXXAccessSpecifier");
   }
 
   llvm_unreachable("Unhandled CXCursorKind");