Add standalone JIT option -XX:[+|-]PerfTool

[yathamravali]

When specifying multiple JIT options, currently only the last
JIT option will be in effect. Added a standalone alternative for
-Xjit:perfTool in -XX:+PerfTool to avoid clobbering pre-existing
JIT command line options.

New Options
-XX:+PerfTool Enables Perf Tool
-XX:-PerfTool Disables Perf Tool

Fixes: #14157
Signed-off-by: Ravali Yatham ravaliyatham@gmail.com

[yathamravali]

@0xdaryl - Kindly review this PR.

[yathamravali]

@dsouzai - Incorporated suggested changes, PTAL.

[dsouzai]

jenkins test sanity all jdk17

[dsouzai]

@pshipton would something like this require documenting in the openj9 docs? It's basically an alias for perfTool in the -Xjit options.

[pshipton]

Don't forget to open a doc issue for the new option.

[pshipton]

would something like this require documenting in the openj9 docs? It's basically an alias for perfTool in the -Xjit options.

Is there some reason not to document it? We want it documented so it can be used.

[dsouzai]

Is there some reason not to document it? We want it documented so it can be used.

I was asking more as a process clarification.

[dsouzai]

I'm cancelling the build jobs because I realized the commits are not squashed. @yathamravali can you please squash your commits so that there's just one commit?

[yathamravali]

@dsouzai - Squashed the commits.

[dsouzai]

jenkins test sanity all jdk17

[yathamravali]

Opened doc issue for the new option - eclipse-openj9/openj9-docs#983

[yathamravali]

@pshipton - Could you help with the release target to mention in doc issue please?

[pshipton]

As it stands the change will be in the 0.36 release in Jan, but if it's low risk and @dsouzai agrees, you can open a PR to double deliver it to the v0.35.0-release branch to get it into the Oct release.

[dsouzai]

I'd say it's low risk as the default behaviour is unchanged. If the next release is all the way in Jan, then I suppose it makes sense to double deliver this for 0.35 if there's still time to do so.