[turbofan] Enforce native context specialization.

src/compiler/js-global-object-specialization.h

Index: src/compiler/js-global-object-specialization.h
diff --git a/src/compiler/js-global-object-specialization.h b/src/compiler/js-global-object-specialization.h
index a6c511e9e5f039a7aa3a3be87fec73a6b9967fd3..50bdd80a88cd613047b739117fd1edd1af643a71 100644
--- a/src/compiler/js-global-object-specialization.h
+++ b/src/compiler/js-global-object-specialization.h
@@ -28,7 +28,7 @@ class TypeCache;
 class JSGlobalObjectSpecialization final : public AdvancedReducer {
  public:
   JSGlobalObjectSpecialization(Editor* editor, JSGraph* jsgraph,
-                               MaybeHandle<Context> native_context,
+                               Handle<JSGlobalObject> global_object,
                                CompilationDependencies* dependencies);
 
   Reduction Reduce(Node* node) final;
@@ -37,12 +37,8 @@ class JSGlobalObjectSpecialization final : public AdvancedReducer {
   Reduction ReduceJSLoadGlobal(Node* node);
   Reduction ReduceJSStoreGlobal(Node* node);
 
-  // Retrieve the global object from the given {node} if known.
-  MaybeHandle<JSGlobalObject> GetGlobalObject(Node* node);
-
   struct ScriptContextTableLookupResult;
-  bool LookupInScriptContextTable(Handle<JSGlobalObject> global_object,
-                                  Handle<Name> name,
+  bool LookupInScriptContextTable(Handle<Name> name,
                                   ScriptContextTableLookupResult* result);
 
   Graph* graph() const;
@@ -51,11 +47,11 @@ class JSGlobalObjectSpecialization final : public AdvancedReducer {
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   SimplifiedOperatorBuilder* simplified() const;
-  MaybeHandle<Context> native_context() const { return native_context_; }
+  Handle<JSGlobalObject> global_object() const { return global_object_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
 
   JSGraph* const jsgraph_;
-  MaybeHandle<Context> native_context_;
+  Handle<JSGlobalObject> const global_object_;
   CompilationDependencies* const dependencies_;
   TypeCache const& type_cache_;