[turbofan] Enforce native context specialization.

src/compiler/js-create-lowering.h

Index: src/compiler/js-create-lowering.h
diff --git a/src/compiler/js-create-lowering.h b/src/compiler/js-create-lowering.h
index 6248ca29822085c0133900c8f460cb74803d5ac0..7861046f8506f44cef212249765ec7ce07f33788 100644
--- a/src/compiler/js-create-lowering.h
+++ b/src/compiler/js-create-lowering.h
@@ -31,7 +31,7 @@ class JSCreateLowering final : public AdvancedReducer {
  public:
   JSCreateLowering(Editor* editor, CompilationDependencies* dependencies,
                    JSGraph* jsgraph, MaybeHandle<LiteralsArray> literals_array,
-                   MaybeHandle<Context> native_context, Zone* zone)
+                   Handle<Context> native_context, Zone* zone)
       : AdvancedReducer(editor),
         dependencies_(dependencies),
         jsgraph_(jsgraph),
@@ -77,13 +77,12 @@ class JSCreateLowering final : public AdvancedReducer {
 
   // Infers the LiteralsArray to use for a given {node}.
   MaybeHandle<LiteralsArray> GetSpecializationLiterals(Node* node);
-  // Infers the native context to use for a given {node}.
-  MaybeHandle<Context> GetSpecializationNativeContext(Node* node);
 
   Factory* factory() const;
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const;
+  Handle<Context> native_context() const { return native_context_; }
   JSOperatorBuilder* javascript() const;
   CommonOperatorBuilder* common() const;
   SimplifiedOperatorBuilder* simplified() const;
@@ -94,7 +93,7 @@ class JSCreateLowering final : public AdvancedReducer {
   CompilationDependencies* const dependencies_;
   JSGraph* const jsgraph_;
   MaybeHandle<LiteralsArray> const literals_array_;
-  MaybeHandle<Context> const native_context_;
+  Handle<Context> const native_context_;
   Zone* const zone_;
 };