Fix <rdar://problem/6251012> clang: Blocks are objects too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@56791 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaExprObjC.cpp

@@ -281,7 +281,8 @@ Sema::ExprResult Sema::ActOnInstanceMessage(ExprTy *receiver, Selector Sel,
     Context.getCanonicalType(RExpr->getType()).getUnqualifiedType();
   
   // Handle messages to id.
-  if (ReceiverCType == Context.getCanonicalType(Context.getObjCIdType())) {
+  if (ReceiverCType == Context.getCanonicalType(Context.getObjCIdType()) ||
+      ReceiverCType->getAsBlockPointerType()) {
     ObjCMethodDecl *Method = InstanceMethodPool[Sel].Method;
     if (!Method)
       Method = FactoryMethodPool[Sel].Method;

test/Sema/block-as-object.m

@@ -0,0 +1,12 @@
+// RUN: clang %s -fsyntax-only -verify
+
+@interface Whatever
+- copy;
+@end
+
+typedef long (^MyBlock)(id obj1, id obj2);
+
+void foo(MyBlock b) {
+    id bar = [b copy];
+}
+