[runtime] Remove the redundant %_IsObject intrinsic.

src/hydrogen.cc

 // Copyright 2013 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/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast-numbering.h"
@@ skipping 12024 matching lines @@
 void HOptimizedGraphBuilder::GenerateIsRegExp(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HHasInstanceTypeAndBranch* result =
       New<HHasInstanceTypeAndBranch>(value, JS_REGEXP_TYPE);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
-void HOptimizedGraphBuilder::GenerateIsObject(CallRuntime* call) {
-  DCHECK(call->arguments()->length() == 1);
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* value = Pop();
-  HIsObjectAndBranch* result = New<HIsObjectAndBranch>(value);
-  return ast_context()->ReturnControl(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateToObject(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HValue* result = BuildToObject(value);
   return ast_context()->ReturnValue(result);
 }
 
 
 void HOptimizedGraphBuilder::GenerateIsJSProxy(CallRuntime* call) {
@@ skipping 1394 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8