RFR: 8251462: Remove legacy compilation policy [v2]

[Igor Veresov]

On Mon, 11 Jan 2021 17:54:10 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> I see some regression on ARM32 with this change:
>> http://cr.openjdk.java.net/~bulasevich/tmp/8251462_jtreg_hotspot/
>
>> I see some regression on ARM32 with this change:
>> http://cr.openjdk.java.net/~bulasevich/tmp/8251462_jtreg_hotspot/
> 
> I don't think those are related to the changes. Those are probably some preexisting c1 and c2 problems respectively that for some reason weren't triggered before. 
> 
> The TestOptionsWithRanges is my fault though. I'll fix that.

I've added the flag validity pre-checks, which should solve the issues with VM complaining about tiered flags being invalid as a result of CompileThreshold and friends being invalid. We'd have to solve the C1 SIGILL and the C2 loop opts crash separately. Those are not really related to the change.

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PR: https://git.openjdk.java.net/jdk/pull/1985