RFR: 8316581: Improve performance of Symbol::print_value_on() [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this (hopefully correct) optimization of `Symbol::print_value_on()`; investigation into class unloading time distribution showed that a lot of time is spent in the `UnloadingEventLog::log()` call (25+%, see CR).
> 
> The reason seems to be the use of `outputStream::print()` without any need for formatting.
> 
> This seems to decrease time spent in this logging by almost 10x.
> 
> Testing: hs_err output seems still be the same, GHA
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  coleen review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15838/files
  - new: https://git.openjdk.org/jdk/pull/15838/files/d89cf89c..1ffdce2e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15838&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15838&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/15838.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15838/head:pull/15838

PR: https://git.openjdk.org/jdk/pull/15838