Assign unique IDs to FunctionLiterals

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index b8fc5ffd4787547c95ad0a8a77eebad9d662e2a7..64d3bfe9b5dcd7c09a33ab4a87f1d945a781d6cf 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -13608,8 +13608,10 @@ MaybeHandle<SharedFunctionInfo> Script::FindSharedFunctionInfo(
     if (fun->function_token_position() == shared->function_token_position() &&
         fun->start_position() == shared->start_position() &&
         fun->end_position() == shared->end_position()) {
+      DCHECK_EQ(fun->function_literal_id(), shared->function_literal_id());
       return Handle<SharedFunctionInfo>(shared);
     }
+    DCHECK_NE(fun->function_literal_id(), shared->function_literal_id());
   }
   return MaybeHandle<SharedFunctionInfo>();
 }
@@ -13961,6 +13963,7 @@ void SharedFunctionInfo::InitFromFunctionLiteral(
   shared_info->set_requires_class_field_init(lit->requires_class_field_init());
   shared_info->set_is_class_field_initializer(
       lit->is_class_field_initializer());
+  shared_info->set_function_literal_id(lit->function_literal_id());
   SetExpectedNofPropertiesFromEstimate(shared_info, lit);
 }