Use a different map to distinguish eval contexts

src/contexts.cc

Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index 4fb3c833b773195f706c52bcec56cddd8d932ebe..7dd7f4822ecdfaa3099caaacc7ea59de811fa098 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -74,7 +74,8 @@ Context* Context::declaration_context() {
   Context* current = this;
   while (!current->is_declaration_context()) {
     current = current->previous();
-    DCHECK(current->closure() == closure());
+    // Note: the closure may change while finding the declaration context,
+    // e.g., for sloppy direct eval
   }
   return current;
 }