RFR(M): 8069412 : Locks need better debug-printing support

[Roland Westrelin]

>> Is this change to make the LogCompilation tool parse older version of the log file?
> 
> That is correct, and I will change the comment to
> 
> // Log files from older hotspots may lack inline_id, and zero is an acceptable substitute
> // that allows processing to continue.

That looks good to me. Thanks.

> I could log a "Missing inline_id, substituting zero" to System.err if you think that is appropriate.

I don’t think that’s needed.

Roland.