RFR: 8256523: Streamline Java SHA2 implementation

[Valerie Peng]

On Fri, 20 Nov 2020 06:46:09 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Changes look good.
>
> Thank you, @valeriepeng. I am not sure what is the review policy for this code, should I wait for another reviewer?

One reviewer is good enough. You can go ahead and integrate. Thanks~

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PR: https://git.openjdk.java.net/jdk/pull/1283