Implementation of AST for @protocol expression.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@43075 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/AST/Expr.cpp b/AST/Expr.cpp
index 1b989a4..d691332 100644
--- a/AST/Expr.cpp
+++ b/AST/Expr.cpp
@@ -1084,6 +1084,10 @@
 Stmt::child_iterator ObjCSelectorExpr::child_begin() { return NULL; }
 Stmt::child_iterator ObjCSelectorExpr::child_end() { return NULL; }
 
+// ObjCProtocolExpr
+Stmt::child_iterator ObjCProtocolExpr::child_begin() { return NULL; }
+Stmt::child_iterator ObjCProtocolExpr::child_end() { return NULL; }
+
 // ObjCMessageExpr
 Stmt::child_iterator ObjCMessageExpr::child_begin() {
   return reinterpret_cast<Stmt**>(&SubExprs[0]);