UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
Execute attached JavaScript code

What is the expected behavior?

What went wrong?
class c{}
for(var i =0; i < 312260; i++){
  c = (class extends c {});
}
c.x = 42

Crashed report ID: 

How much crashed? Just one tab

Is it a problem with a plugin? No 

Did this work before? N/A 

Chrome version: 67.0.3396.99  Channel: stable
OS Version: 10.0
Flash Version: 

If recursive definition of class c is not in the loop, it is okay. But, if it is in the loop (maybe jitted?), it crashes with StackOverflow.