Revert of [intrinsic] Drop the %_ValueOf intrinsic.

src/crankshaft/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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 12618 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::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);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
   HValue* index = Pop();
   HValue* string = Pop();
   HInstruction* result = BuildStringCharCodeAt(string, index);
   return ast_context()->ReturnInstruction(result, call->id());
 }
@@ skipping 978 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8