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

[Xin Liu]

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

@danlemmond , I understand Kozlov's comment. 

your change 36bc753 covers c2's optimization. There are another 2 places refer to _directive->BreakAtCompileOption. I think you need to change them to env()-> break_at_compile as well. 

https://github.com/openjdk/jdk/blob/master/src/hotspot/share/c1/c1_Compilation.cpp#L449
https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/compile.cpp#L506

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