Revert of [regexp] Port RegExpExec

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index ae96035f53839b2ec334ef432ae9635ef4506d3c..db4d9b5a0cb544bb43f51a088e57eb69eef520d7 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -16392,7 +16392,7 @@
     // Map has changed, so use generic, but slower, method.
     RETURN_ON_EXCEPTION(
         isolate,
-        JSReceiver::SetProperty(regexp, factory->lastIndex_string(),
+        JSReceiver::SetProperty(regexp, factory->last_index_string(),
                                 Handle<Smi>(Smi::FromInt(0), isolate), STRICT),
         JSRegExp);
   }