Remove non-const form of lookupFieldDeclForIvar.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69563 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjC.cpp b/lib/CodeGen/CGObjC.cpp
index 2ac4f9c..e22efa1 100644
--- a/lib/CodeGen/CGObjC.cpp
+++ b/lib/CodeGen/CGObjC.cpp
@@ -195,7 +195,7 @@
                                            Types.ConvertType(PD->getType())));
     EmitReturnOfRValue(RV, PD->getType());
   } else {
-    FieldDecl *Field = 
+    const FieldDecl *Field = 
       IMP->getClassInterface()->lookupFieldDeclForIvar(getContext(), Ivar);
     LValue LV = EmitLValueForIvar(TypeOfSelfObject(),
                                   LoadObjCSelf(), Ivar, Field, 0);