[jdk17] RFR: 8269543: The warning for System::setSecurityManager should only appear once for each caller [v2]

[Lance Andersen]

On Wed, 30 Jun 2021 15:45:25 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Add a cache to record which sources have called `System::setSecurityManager` and only print out warning lines once for each.
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update cache key from String to Class

Marked as reviewed by lancea (Reviewer).

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PR: https://git.openjdk.java.net/jdk17/pull/166