RFR: 8282182: Document algorithm used to encode aarch64 logical immediate operands.

[Andrew Dinn]

On Fri, 18 Feb 2022 17:12:08 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

> This *documentation only* change explains how logical immediate mask values are derived from valid logical instruction operands. The encoding function is used to populate a sparse array that maps valid masks to a unique set of input operand values and a reverse lookup array that maps inputs to the associated mask.

Document algorithm used to encode aarch64 logical immediate operands.

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PR: https://git.openjdk.java.net/jdk/pull/7536