RFR: 7268: Show icons for modifiers in the method profiling page [v2]

[Marcus Hirt]

On Thu, 10 Jun 2021 21:13:26 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> I'll check in the new icons in the jmc-graphics repo.
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Cleaner code

![image](https://user-images.githubusercontent.com/16906077/121668586-be8c0d80-caab-11eb-811a-ec337db4d6a5.png)

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PR: https://git.openjdk.java.net/jmc/pull/264