[Sema] Prefer to use ObjCInterfaceDecl's protocol_begin()/protocol_end() iterators instead of
ObjCInterfaceDecl::getReferencedProtocols(), because the iterators are safe to use
even if the caller did not check that the interface is a definition.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152597 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjCGNU.cpp b/lib/CodeGen/CGObjCGNU.cpp
index 3e5c4a2..4dedc9d 100644
--- a/lib/CodeGen/CGObjCGNU.cpp
+++ b/lib/CodeGen/CGObjCGNU.cpp
@@ -2070,9 +2070,9 @@
   }
   // Collect the names of referenced protocols
   SmallVector<std::string, 16> Protocols;
-  const ObjCList<ObjCProtocolDecl> &Protos =ClassDecl->getReferencedProtocols();
-  for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(),
-       E = Protos.end(); I != E; ++I)
+  for (ObjCInterfaceDecl::protocol_iterator
+         I = ClassDecl->protocol_begin(),
+         E = ClassDecl->protocol_end(); I != E; ++I)
     Protocols.push_back((*I)->getNameAsString());