Revert of [intrinsic] Drop the %_ValueOf intrinsic.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index a39a8e5617cd7ea91cf82dc3dbf325b5cda04313..cf5e010afdcb32c1b663909d8ca47fb56cbd9a58 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -12636,6 +12636,34 @@
 }
 
 
+void HOptimizedGraphBuilder::GenerateValueOf(CallRuntime* call) {
+  DCHECK(call->arguments()->length() == 1);
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  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::ForObservableJSObjectOffset(
+                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());
+}
+
+
 // Fast support for charCodeAt(n).
 void HOptimizedGraphBuilder::GenerateStringCharCodeAt(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 2);