RFR: 7903448: JMH: Override the use of compiler hints using a system property

[Aleksey Shipilev]

On Thu, 23 Mar 2023 18:41:24 GMT, Gilles Duboscq <gdub at openjdk.org> wrote:

>> Using `-Djmh.compilerhints.mode=true` will force the use of compiler hints. `-Djmh.compilerhints.mode=false` will prevent the use of compiler hints. When the system property is not set, the current beahviour based on vm name and version will be used by default.
>> 
>> This is especially useful when working with uncommon / rare JVMs or when adding compiler hints support to a new JVM.
>> 
>> I considered auto-detecting support for compiler hints but that didn't fit very well in the current code and required much more intrusive changes.
>
> I have changed the `jmh.compilerhints.mode` system property to accept the 3 suggested values and implemented it following the implementation of the blackhole modes.

Ping @gilles-duboscq -- do you want to complete this, or want me to take over?

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PR Comment: https://git.openjdk.org/jmh/pull/96#issuecomment-1505097020