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 c6953cdad52cca2b4ccd602ff1f67ba6edf950b7..68fa8d8c3daaf3a71f75a91f8d9240402fbc6a46 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -2000,10 +2000,9 @@ 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
@@ -2020,7 +2019,7 @@ 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);
 }