RFR: 8296734: JarVerifier:: mapSignersToCodeSource should cache in map

[Weijun Wang]

On Thu, 10 Nov 2022 01:02:00 GMT, pandaapo <duke at openjdk.org> wrote:

> The cache named `signerToCodeSource` in `JarVerifier` is never used now.

The method is not called since JDK 9, and that's why I set Affected Version/s to 8-pool. We don't intend to fix this in the current release.

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PR: https://git.openjdk.org/jdk/pull/11072