RFR: 8248188: Add IntrinsicCandidate and API for Base64 decoding

[CoreyAshford]

On Mon, 5 Oct 2020 15:53:26 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Nobody replied, so I suggest to leave aotCodeHeap.cpp as it was. AOT folks can add it when they need it.

Ok, I will drop that change from that PR.  Thank you.

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PR: https://git.openjdk.java.net/jdk/pull/293