[modules] Add an IsModule flag to ScriptOriginOptions.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 9c5dd0cd73ec7be83eecb9cf5242ead0845da11b..4f4f042702b4b7eaa1e6d49143d3b89152cade75 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -690,9 +690,10 @@ MaybeLocal<Module> Shell::FetchModuleTree(Local<Context> context,
     printf("Error reading '%s'\n", file_name.c_str());
     Shell::Exit(1);
   }
-  ScriptOrigin origin(
+  ScriptOrigin origin = ScriptOrigin::ModuleOrigin(
       String::NewFromUtf8(isolate, file_name.c_str(), NewStringType::kNormal)
-          .ToLocalChecked());
+          .ToLocalChecked(),
+      isolate);
   ScriptCompiler::Source source(source_text, origin);
   Local<Module> module;
   if (!ScriptCompiler::CompileModule(isolate, &source).ToLocal(&module)) {