RFR: CODETOOLS-7902799: perfasm still handles event modifiers incorrectly [v2]

[Aleksey Shipilev]

On Wed, 2 Dec 2020 18:49:59 GMT, Volker Simonis <simonis at openjdk.org> wrote:

>> Not until the pre-JDK16-freeze crunch is over, I am afraid. Does it block your work?
>
> No, no problem. I was just unsure what it means that you've self-assigned this to you. Apparently it means that you'll take care :)
> 
> Thanks for the quick response.

Unfortunately, this regresses `perfasm` on systems that reply `cycles:u:` in default configuration:

21831844.118759: cycles:u:  ffff000010081478 [unknown] ([unknown])

...yields:

PrintAssembly processed: 202041 total address lines.
Perf output processed (skipped 12.981 seconds):
 Column 1: cycles (0 events)

-------------

PR: https://git.openjdk.java.net/jmh/pull/9