Refactor optimized in hydrogen only runtime functions.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index a774f60129184fd6cf08f338cef5183bcfd6c362..176085bbfe77b46083a89869c9167257823f784d 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -2076,9 +2076,10 @@ HValue* HGraphBuilder::BuildUncheckedStringAdd(
       // Fallback to the runtime to add the two strings.
       Add<HPushArgument>(left);
       Add<HPushArgument>(right);
-      Push(Add<HCallRuntime>(isolate()->factory()->empty_string(),
-                             Runtime::FunctionForId(Runtime::kStringAdd),
-                             2));
+      Push(Add<HCallRuntime>(
+            isolate()->factory()->empty_string(),
+            Runtime::FunctionForId(Runtime::kHiddenStringAdd),
+            2));
     }
     if_sameencodingandsequential.End();
   }
@@ -8408,6 +8409,7 @@ void HOptimizedGraphBuilder::VisitCallNew(CallNew* expr) {
 const HOptimizedGraphBuilder::InlineFunctionGenerator
     HOptimizedGraphBuilder::kInlineFunctionGenerators[] = {
         INLINE_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS)
+        INLINE_OPTIMIZED_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS)
 };
 #undef INLINE_FUNCTION_GENERATOR_ADDRESS
 
@@ -8734,7 +8736,8 @@ void HOptimizedGraphBuilder::VisitCallRuntime(CallRuntime* expr) {
   const Runtime::Function* function = expr->function();
   ASSERT(function != NULL);
 
-  if (function->intrinsic_type == Runtime::INLINE) {
+  if (function->intrinsic_type == Runtime::INLINE ||
+      function->intrinsic_type == Runtime::INLINE_OPTIMIZED) {
     ASSERT(expr->name()->length() > 0);
     ASSERT(expr->name()->Get(0) == '_');
     // Call to an inline function.