Call JS functions via native context instead of js builtins object.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 3a53f873cc2f16a4ad503cb4be50d762a751a004..c45b313faff6df30717a3f5a3adb694a5603a413 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -2003,10 +2003,9 @@ inline HInstruction* HGraphBuilder::AddUncasted<HReturn>(HConstant* value) {
 
 template<>
 inline HCallRuntime* HGraphBuilder::Add<HCallRuntime>(
-    Handle<String> name,
     const Runtime::Function* c_function,
     int argument_count) {
-  HCallRuntime* instr = New<HCallRuntime>(name, c_function, argument_count);
+  HCallRuntime* instr = New<HCallRuntime>(c_function, argument_count);
   if (graph()->info()->IsStub()) {
     // When compiling code stubs, we don't want to save all double registers
     // upon entry to the stub, but instead have the call runtime instruction
@@ -2023,7 +2022,7 @@ inline HInstruction* HGraphBuilder::AddUncasted<HCallRuntime>(
     Handle<String> name,
     const Runtime::Function* c_function,
     int argument_count) {
-  return Add<HCallRuntime>(name, c_function, argument_count);
+  return Add<HCallRuntime>(c_function, argument_count);
 }