Assign unique IDs to FunctionLiterals

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 89d8c75ca0e02dec4e4ede8079ffa150ba079d6a..f0fbcda5fbdfed08605d835f315b946e83667007 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -13611,8 +13611,10 @@ 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_num(), shared->function_literal_num());
       return Handle<SharedFunctionInfo>(shared);
     }
+    DCHECK_NE(fun->function_literal_num(), shared->function_literal_num());
   }
   return MaybeHandle<SharedFunctionInfo>();
 }
@@ -13964,6 +13966,7 @@ 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_num(lit->function_literal_num());
   SetExpectedNofPropertiesFromEstimate(shared_info, lit);
 }