RFR: 7903321: Use a set instead of a map to record methods in class 'MethodGroup' [v3]

[Aleksey Shipilev]

On Wed, 21 Sep 2022 11:36:16 GMT, Guoxiong Li <gli at openjdk.org> wrote:

>> Hi all,
>> 
>> This patch changes the type of the field `MethodGroup#methods` from a map to a set so that it is more suitable for its meaning.
>> 
>> Thanks for the taking the time to review.
>> 
>> Best Regards,
>> -- Guoxiong
>
> Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix exception message.

I'll sponsor after GHAs go green.

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PR: https://git.openjdk.org/jmh/pull/79