[regexp] Fix fallback path in RegExpExec

src/regexp/regexp-utils.cc

Index: src/regexp/regexp-utils.cc
diff --git a/src/regexp/regexp-utils.cc b/src/regexp/regexp-utils.cc
index 8de904b72b7883192463c502a2c56d1245c285ca..963bb68b7f9749ac47893415352afcad6b2da6ed 100644
--- a/src/regexp/regexp-utils.cc
+++ b/src/regexp/regexp-utils.cc
@@ -154,7 +154,7 @@ MaybeHandle<Object> RegExpUtils::RegExpExec(Isolate* isolate,
     ScopedVector<Handle<Object>> argv(argc);
     argv[0] = string;
 
-    return Execution::Call(isolate, exec, regexp_exec, argc, argv.start());
+    return Execution::Call(isolate, regexp_exec, regexp, argc, argv.start());
   }
 }