RFR: 7262: Add rule for when the JVM version is < OpenJDK 8u302 [v7]

[Marcus Hirt]

On Wed, 2 Jun 2021 17:10:01 GMT, Oskar Jung <github.com+1101441+ojung at openjdk.org> wrote:

>> This PR contains a rule for notifying users of JVM < OpenJDK8u302 to upgrade to avoid performance issues caused by https://bugs.openjdk.java.net/browse/JDK-8266723.
>> 
>> **JFR recorded on OpenJDK 8u302 EA:**
>> ![Screen Shot 2021-06-02 at 14 45 46](https://user-images.githubusercontent.com/1101441/120482697-a9c7bf80-c3b1-11eb-83e0-7d17b23cfd99.png)
>> 
>> **JFR recorded on OpenJDK 8u292:**
>> ![Screen Shot 2021-06-02 at 15 49 14](https://user-images.githubusercontent.com/1101441/120492943-ce746500-c3ba-11eb-999c-e75bf3fba245.png)
>
> Oskar Jung has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixup! 7262: Add rule for when the JVM version is < OpenJDK 8u302

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/256