RFR: 8357600: Patch nmethod flushing message to include more details

[Aleksey Shipilev]

On Thu, 22 May 2025 22:40:51 GMT, Cesar Soares Lucas <cslucas at openjdk.org> wrote:

> Please review this patch for adding more details to nmethod flushing message. These details are particularly important when investigating interaction of JVMCI compiled code and code cache flushing heuristics.
> 
> Tested on Linux x64 with JTREG tier1-3 using fastdebug and release builds.

A bit concerned about performance impact of this logging, especially since we are under `CodeCache_lock`. So I would suggest two improvements:

1. Maybe move logging before acquiring `CodeCache_lock`? Not sure if it is safe for various `CodeCache::*` getters.

2. Predicate the argument preparation/logging with:

``` 
  LogTarget(Debug, codecache) lt;
  if (lt.is_enabled()) {
    ...

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PR Review: https://git.openjdk.org/jdk/pull/25402#pullrequestreview-2863813220