RFR: 8251462: Remove legacy compilation policy [v4]

[Vladimir Kozlov]

On Fri, 22 Jan 2021 19:50:48 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> src/hotspot/share/compiler/compilerDefinitions.cpp line 84:
>> 
>>> 82:     } else if (CompilerConfig::is_c2_or_jvmci_compiler_only()) {
>>> 83:       _mode = Mode::HIGH_ONLY;
>>> 84:     } else if (CompilerConfig::is_jvmci_compiler() && !TieredCompilation) {
>> 
>> Should you check `CompilerConfig::is_tiered()` instead of `TieredCompilation` flag?
>
> I wanted to be explicit about what's happening here. I'd like it to be obvious that the we're switching to ```HIGH_ONLY_QUICK_INTERNAL``` mode as a result of the user specifying -XX:-TieredCompilation on the command line.
> 
> There is a bug on this line however. I should be checking if c1 is present and enabled.

okay

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