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

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 47a22df239854b4ef2568736d4c8bcaa87a2a32a..aca372689b845ca099564d0f42fb9b014298db9b 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -148,17 +148,10 @@ Node* BytecodeGraphBuilder::BuildLoadImmutableObjectField(Node* object,
 }
 
 
-Node* BytecodeGraphBuilder::BuildLoadGlobalObject() {
-  const Operator* load_op =
-      javascript()->LoadContext(0, Context::GLOBAL_OBJECT_INDEX, true);
-  return NewNode(load_op, GetFunctionContext());
-}
-
-
 Node* BytecodeGraphBuilder::BuildLoadNativeContextField(int index) {
-  Node* global = BuildLoadGlobalObject();
-  Node* native_context =
-      BuildLoadObjectField(global, JSGlobalObject::kNativeContextOffset);
+  const Operator* op =
+      javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true);
+  Node* native_context = NewNode(op, environment()->Context());
   return NewNode(javascript()->LoadContext(0, index, true), native_context);
 }