8372950: Pem.pemEncoded should cache the Pattern

[fguallini]

PEM is using the String.replaceAll() method that creates a Pattern internally every time. This looks like a minor inefficiency and since it is caching Patterns for other cases, it should do the same here.

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• JDK-8372950: Pem.pemEncoded should cache the Pattern (Enhancement - P4)

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