RFR: 8255216: ciEnv::_break_at_compile isn't in use

[Dean Long]

On Tue, 5 Jan 2021 09:00:37 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> I wasn't sure whether or not we wanted to roll the removal of all dead code into this issue or just _break_at_compile. The JBS issue specifically mentions _break_at_compile so that's what I removed here - can expand to do other stuff if you think it's a good idea.
>
> I think it's fine to remove all that dead code with this issue

Should CIBreakAtOSR and CIBreakAt be removed too, or is it a bug that these flags are ignored?

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PR: https://git.openjdk.java.net/jdk/pull/1806