Remove the --ignition-generators flag.

test/cctest/interpreter/test-interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/execution.h"
 #include "src/handles.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
@@ skipping 4165 matching lines @@
     InterpreterTester tester(handles.main_isolate(), source.c_str());
     v8::Local<v8::String> message = tester.CheckThrowsReturnMessage()->Get();
     v8::Local<v8::String> expected_string = v8_str(const_decl[i].second);
     CHECK(
         message->Equals(CcTest::isolate()->GetCurrentContext(), expected_string)
             .FromJust());
   }
 }
 
 TEST(InterpreterGenerators) {
-  bool old_flag = FLAG_ignition_generators;
-  FLAG_ignition_generators = true;
-
   HandleAndZoneScope handles;
   i::Isolate* isolate = handles.main_isolate();
   i::Factory* factory = isolate->factory();
 
   std::pair<const char*, Handle<Object>> tests[] = {
       {"function* f() { }; return f().next().value",
        factory->undefined_value()},
       {"function* f() { yield 42 }; return f().next().value",
        factory->NewNumberFromInt(42)},
       {"function* f() { for (let x of [42]) yield x}; return f().next().value",
        factory->NewNumberFromInt(42)},
   };
 
   for (size_t i = 0; i < arraysize(tests); i++) {
     std::string source(InterpreterTester::SourceForBody(tests[i].first));
     InterpreterTester tester(handles.main_isolate(), source.c_str());
     auto callable = tester.GetCallable<>();
 
     Handle<i::Object> return_value = callable().ToHandleChecked();
     CHECK(return_value->SameValue(*tests[i].second));
   }
-
-  FLAG_ignition_generators = old_flag;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8