[regexp] Ensure there are no shape changes on the fast path

src/builtins/builtins-string.cc

Index: src/builtins/builtins-string.cc
diff --git a/src/builtins/builtins-string.cc b/src/builtins/builtins-string.cc
index 9967f958601c390818a3d64dbd909df3a795ff9f..7cef567cf9555a22e4ce27029a4b61db6410d91a 100644
--- a/src/builtins/builtins-string.cc
+++ b/src/builtins/builtins-string.cc
@@ -1224,7 +1224,7 @@ void StringBuiltinsAssembler::MaybeCallFunctionAtSymbol(
     Label stub_call(this), slow_lookup(this);
 
     RegExpBuiltinsAssembler regexp_asm(state());
-    regexp_asm.BranchIfFastRegExp(context, object_map, &stub_call,
+    regexp_asm.BranchIfFastRegExp(context, object, object_map, &stub_call,
                                   &slow_lookup);
 
     Bind(&stub_call);