Remove the HValueOf instruction.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 54c3451fb475b0af6b709e992993f7853e0854c5..e38d9f3b92ee9cb98536ced584d48d2f309b1520 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -10313,9 +10313,27 @@ void HOptimizedGraphBuilder::GenerateClassOf(CallRuntime* call) {
 void HOptimizedGraphBuilder::GenerateValueOf(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* value = Pop();
-  HValueOf* result = New<HValueOf>(value);
-  return ast_context()->ReturnInstruction(result, call->id());
+  HValue* object = Pop();
+
+  IfBuilder if_objectisvalue(this);
+  HValue* objectisvalue = if_objectisvalue.If<HHasInstanceTypeAndBranch>(
+      object, JS_VALUE_TYPE);
+  if_objectisvalue.Then();
+  {
+    // Return the actual value.
+    Push(Add<HLoadNamedField>(
+            object, objectisvalue,
+            HObjectAccess::ForJSObjectOffset(JSValue::kValueOffset)));
+    Add<HSimulate>(call->id(), FIXED_SIMULATE);
+  }
+  if_objectisvalue.Else();
+  {
+    // If the object is not a value return the object.
+    Push(object);
+    Add<HSimulate>(call->id(), FIXED_SIMULATE);
+  }
+  if_objectisvalue.End();
+  return ast_context()->ReturnValue(Pop());
 }