[runtime] Remove useless %_IsUndetectableObject 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/v8.h"
 
@@ skipping 12077 matching lines @@
     if_fast_packed.Or();
     if_fast_packed.If<HCompareNumericAndBranch>(
         elements_kind, Add<HConstant>(FAST_DOUBLE_ELEMENTS), Token::EQ);
     if_fast_packed.JoinContinuation(&continuation);
   }
   if_not_smi.JoinContinuation(&continuation);
   return ast_context()->ReturnContinuation(&continuation, call->id());
 }
 
 
-void HOptimizedGraphBuilder::GenerateIsUndetectableObject(CallRuntime* call) {
-  DCHECK(call->arguments()->length() == 1);
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* value = Pop();
-  HIsUndetectableAndBranch* result = New<HIsUndetectableAndBranch>(value);
-  return ast_context()->ReturnControl(result, call->id());
-}
-
-
 // Support for construct call checks.
 void HOptimizedGraphBuilder::GenerateIsConstructCall(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 0);
   if (function_state()->outer() != NULL) {
     // We are generating graph for inlined function.
     HValue* value = function_state()->inlining_kind() == CONSTRUCT_CALL_RETURN
         ? graph()->GetConstantTrue()
         : graph()->GetConstantFalse();
     return ast_context()->ReturnValue(value);
   } else {
@@ skipping 1324 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8