RFR: 8292026: Remove redundant allocations from DoubleByteEncoder

[Phil Race]

On Fri, 5 Aug 2022 07:07:57 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> There are couple places where new byte array is allocated and then thrown away.

I suspect that once upon a time that was passed in as an arg to be populated .. but the code changed.

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Marked as reviewed by prr (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9767