RFR: 8234863: Increase default value of MaxInlineLevel

[Vladimir Ivanov]

Hi Jason,

> I once experimented [2] with a change to Hotspot to consider our
> bridge-like forwarder methods as exempt from the MaxInlineLevel budget, as
> is the case for lambda form frames. That change alone delivered most of the
> performance benefit of doubling MaxInlneLevel with an unmodified JVM.

Nice! The idea to exclude bridge-like methods from max inline level 
accounting looks very promising. Do you have any plans to continue 
working on it and contribute as a patch into the mainline at some point?

On the heuristic itself, it looks like it can be safely generalized to 
any methods which just call another method irrespective of how many 
arguments they pass (and in what order).

Best regards,
Vladimir Ivanov

> [1] https://github.com/scala/bug/issues/11627#issuecomment-514490505
> [2] https://gist.github.com/retronym/d27090a68570485c3e329a52db0c7b25