[builtins] Properly optimize Object.prototype.isPrototypeOf.

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 <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 1256 matching lines @@
 }
 
 Type* Typer::Visitor::TypeJSDeleteProperty(Node* node) {
   return Type::Boolean();
 }
 
 Type* Typer::Visitor::TypeJSHasProperty(Node* node) { return Type::Boolean(); }
 
 // JS instanceof operator.
 
+Type* Typer::Visitor::JSHasInPrototypeChainTyper(Type* lhs, Type* rhs,
+                                                 Typer* t) {
+  return Type::Boolean();
+}
+
 Type* Typer::Visitor::JSInstanceOfTyper(Type* lhs, Type* rhs, Typer* t) {
   return Type::Boolean();
 }
 
 Type* Typer::Visitor::JSOrdinaryHasInstanceTyper(Type* lhs, Type* rhs,
                                                  Typer* t) {
   return Type::Boolean();
 }
 
 Type* Typer::Visitor::TypeJSGetSuperConstructor(Node* node) {
@@ skipping 221 matching lines @@
           return Type::Receiver();
         case kArrayUnshift:
           return t->cache_.kPositiveSafeInteger;
 
         // Object functions.
         case kObjectAssign:
           return Type::Receiver();
         case kObjectCreate:
           return Type::OtherObject();
         case kObjectHasOwnProperty:
+        case kObjectIsPrototypeOf:
           return Type::Boolean();
         case kObjectToString:
           return Type::String();
 
         // RegExp functions.
         case kRegExpCompile:
           return Type::OtherObject();
         case kRegExpExec:
           return Type::Union(Type::Array(), Type::Null(), t->zone());
         case kRegExpTest:
@@ skipping 476 matching lines @@
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::NewConstant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8