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

[Dalibor Topic]

On Wed, 16 Dec 2020 18:38:37 GMT, Dan <github.com+7991079+danlemmond at openjdk.org> wrote:

> _break_at_compile is no longer in use and can be safely removed.
> No new code, and Tier1 tests succeed after code is removed.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8255216

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