Turbofan instanceof lowering needs to address proxies.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1563 matching lines @@
     case Runtime::kInlineToNumber:
       return TypeUnaryOp(node, ToNumber);
     case Runtime::kInlineToObject:
       return TypeUnaryOp(node, ToObject);
     case Runtime::kInlineToPrimitive:
     case Runtime::kInlineToPrimitive_Number:
     case Runtime::kInlineToPrimitive_String:
       return TypeUnaryOp(node, ToPrimitive);
     case Runtime::kInlineToString:
       return TypeUnaryOp(node, ToString);
+    case Runtime::kHasInPrototypeChain:
+      return Type::Boolean();
     default:
       break;
   }
   return Type::Any();
 }
 
 
 Type* Typer::Visitor::TypeJSConvertReceiver(Node* node) {
   return Type::Receiver();
 }
@@ skipping 813 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8