[debug] use correct language mode when parsing eval for scope iterator.

src/debug/debug-scopes.cc

Index: src/debug/debug-scopes.cc
diff --git a/src/debug/debug-scopes.cc b/src/debug/debug-scopes.cc
index 82fd1937ba2afb6b961a887cce32a2e6a4cfb368..9d21a293d202d7988f069884ee2f2cea23b0a40c 100644
--- a/src/debug/debug-scopes.cc
+++ b/src/debug/debug-scopes.cc
@@ -97,6 +97,9 @@ ScopeIterator::ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector,
       DCHECK(scope_info->scope_type() == EVAL_SCOPE);
       info->set_eval();
       info->set_context(Handle<Context>(function->context()));
+      // Language mode may be inherited from the eval caller.
+      // Retrieve it from shared function info.
+      info->set_language_mode(shared_info->language_mode());
     }
   } else {
     // Inner function.