[modules] Add partial support for debug-scopes.

src/contexts.cc

Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index 4fb3c833b773195f706c52bcec56cddd8d932ebe..012944e2c28b5344240852166b40ec2a6cd48cf4 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -82,7 +82,7 @@ Context* Context::declaration_context() {
 Context* Context::closure_context() {
   Context* current = this;
   while (!current->IsFunctionContext() && !current->IsScriptContext() &&
-         !current->IsNativeContext()) {
+         !current->IsModuleContext() && !current->IsNativeContext()) {
     current = current->previous();
     DCHECK(current->closure() == closure());
   }