Revert of [intrinsic] Drop the %_ValueOf intrinsic.

test/cctest/compiler/test-run-intrinsics.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 "test/cctest/compiler/function-tester.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 138 matching lines @@
 
 
 TEST(SubString) {
   FunctionTester T("(function(a,b) { return %_SubString(a,b,b+3); })", flags);
 
   T.CheckCall(T.Val("aaa"), T.Val("aaabbb"), T.Val(0.0));
   T.CheckCall(T.Val("abb"), T.Val("aaabbb"), T.Val(2));
   T.CheckCall(T.Val("aaa"), T.Val("aaa"), T.Val(0.0));
 }
 
+
+TEST(ValueOf) {
+  FunctionTester T("(function(a) { return %_ValueOf(a); })", flags);
+
+  T.CheckCall(T.Val("a"), T.Val("a"));
+  T.CheckCall(T.Val("b"), T.NewObject("(new String('b'))"));
+  T.CheckCall(T.Val(123), T.Val(123));
+  T.CheckCall(T.Val(456), T.NewObject("(new Number(456))"));
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8