[generators] Replace some runtime functions with Turbofan JS operators.

src/compiler/access-builder.h

Index: src/compiler/access-builder.h
diff --git a/src/compiler/access-builder.h b/src/compiler/access-builder.h
index b36277e1b69ec1a6c570f32f33571c998a94e1a7..2029d4ca4f6f62b961885b58a30bf39950d241db 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -52,6 +52,15 @@ class AccessBuilder final : public AllStatic {
   // Provides access to JSFunction::next_function_link() field.
   static FieldAccess ForJSFunctionNextFunctionLink();
 
+  // Provides access to JSGeneratorObject::context() field.
+  static FieldAccess ForJSGeneratorObjectContext();
+
+  // Provides access to JSGeneratorObject::continuation() field.
+  static FieldAccess ForJSGeneratorObjectContinuation();
+
+  // Provides access to JSGeneratorObject::operand_stack() field.
+  static FieldAccess ForJSGeneratorObjectOperandStack();
+
   // Provides access to JSArray::length() field.
   static FieldAccess ForJSArrayLength(ElementsKind elements_kind);