[runtime] Replace global object link with native context link in all contexts.

src/ic/x64/handler-compiler-x64.cc

Index: src/ic/x64/handler-compiler-x64.cc
diff --git a/src/ic/x64/handler-compiler-x64.cc b/src/ic/x64/handler-compiler-x64.cc
index 708311e3dbcb70817b3030722843e2974be4e8e5..5826c7e4ef74f893f50cf549bb6ecab638e85f12 100644
--- a/src/ic/x64/handler-compiler-x64.cc
+++ b/src/ic/x64/handler-compiler-x64.cc
@@ -78,10 +78,7 @@ void PropertyHandlerCompiler::GenerateDictionaryNegativeLookup(
 
 void NamedLoadHandlerCompiler::GenerateDirectLoadGlobalFunctionPrototype(
     MacroAssembler* masm, int index, Register result, Label* miss) {
-  const int offset = Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX);
-  __ movp(result, Operand(rsi, offset));
-  __ movp(result, FieldOperand(result, JSGlobalObject::kNativeContextOffset));
-  __ movp(result, Operand(result, Context::SlotOffset(index)));
+  __ LoadNativeContextSlot(index, result);
   // Load its initial map. The global functions all have initial maps.
   __ movp(result,
           FieldOperand(result, JSFunction::kPrototypeOrInitialMapOffset));