Generate objc_read_weak for __weak objc loads.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59553 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjCRuntime.h b/lib/CodeGen/CGObjCRuntime.h
index 435e148..37544e4 100644
--- a/lib/CodeGen/CGObjCRuntime.h
+++ b/lib/CodeGen/CGObjCRuntime.h
@@ -145,6 +145,8 @@
                              const ObjCAtThrowStmt &S) = 0;
   virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
                                     const ObjCAtSynchronizedStmt &S) = 0;
+  virtual llvm::Value * EmitObjCWeakCall(CodeGen::CodeGenFunction &CGF,
+					 llvm::Value *AddrWeakObj) = 0;
 };
 
 /// Creates an instance of an Objective-C runtime class.