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

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index a6cbfddfe4dae09748db199793b0cee28939b230..8f748ccd59fa651a4e6a674274a603729b7c563f 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -3649,14 +3649,15 @@
 
 
 Node* AstGraphBuilder::BuildLoadGlobalObject() {
-  return BuildLoadNativeContextField(Context::EXTENSION_INDEX);
+  const Operator* load_op =
+      javascript()->LoadContext(0, Context::GLOBAL_OBJECT_INDEX, true);
+  return NewNode(load_op, GetFunctionContext());
 }
 
 
 Node* AstGraphBuilder::BuildLoadNativeContextField(int index) {
-  const Operator* op =
-      javascript()->LoadContext(0, Context::NATIVE_CONTEXT_INDEX, true);
-  Node* native_context = NewNode(op, current_context());
+  Node* global = BuildLoadGlobalObject();
+  Node* native_context = NewNode(javascript()->LoadNativeContext(), global);
   return NewNode(javascript()->LoadContext(0, index, true), native_context);
 }