[stubs] Unify (and optimize) implementation of ToObject.

src/compiler/linkage.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/code-stubs.h"
 #include "src/compiler.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node.h"
 #include "src/compiler/pipeline.h"
@@ skipping 201 matching lines @@
     case Runtime::kToFastProperties:  // TODO(jarin): Is it safe?
     case Runtime::kTraceEnter:
     case Runtime::kTraceExit:
       return 0;
     case Runtime::kInlineArguments:
     case Runtime::kInlineCallFunction:
     case Runtime::kInlineDefaultConstructorCallSuper:
     case Runtime::kInlineGetCallerJSFunction:
     case Runtime::kInlineGetPrototype:
     case Runtime::kInlineRegExpExec:
+    case Runtime::kInlineToObject:
       return 1;
     case Runtime::kInlineDeoptimizeNow:
     case Runtime::kInlineThrowNotDateError:
       return 2;
     default:
       break;
   }
 
   // Most inlined runtime functions (except the ones listed above) can be called
   // without a FrameState or will be lowered by JSIntrinsicLowering internally.
@@ skipping 47 matching lines @@
     Operator::Properties properties, MachineType return_type) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 #endif  // !V8_TURBOFAN_BACKEND
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8