[modules] Don't unnecessarily keep function alive after evaluation.

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 1912 matching lines @@
 MaybeLocal<Value> Module::Evaluate(Local<Context> context) {
   PREPARE_FOR_EXECUTION_WITH_CONTEXT_IN_RUNTIME_CALL_STATS_SCOPE(
       "v8", "V8.Execute", context, Module, Evaluate, MaybeLocal<Value>(),
       InternalEscapableScope, true);
   i::HistogramTimerScope execute_timer(isolate->counters()->execute(), true);
   i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
 
   i::Handle<i::Module> self = Utils::OpenHandle(this);
   // It's an API error to call Evaluate before Instantiate.
-  CHECK(self->code()->IsJSFunction());
+  CHECK(self->instantiated());
 
   Local<Value> result;
   has_pending_exception = !ToLocal(i::Module::Evaluate(self), &result);
   RETURN_ON_FAILED_EXECUTION(Value);
   RETURN_ESCAPED(result);
 }
 
 MaybeLocal<UnboundScript> ScriptCompiler::CompileUnboundInternal(
     Isolate* v8_isolate, Source* source, CompileOptions options,
     bool is_module) {
@@ skipping 7473 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8