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

src/builtins/builtins-string-gen.cc

Index: src/builtins/builtins-string-gen.cc
diff --git a/src/builtins/builtins-string-gen.cc b/src/builtins/builtins-string-gen.cc
index 9100739ea11fd8ead82298af37b9a6bcf02edb15..fcb732b88319fdd93c4558d5fe4c535ac95cd0cb 100644
--- a/src/builtins/builtins-string-gen.cc
+++ b/src/builtins/builtins-string-gen.cc
@@ -969,7 +969,7 @@ 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);