RFR: 8277426: Optimize mask reduction operations on x86 [v2]

[Paul Sandoz]

On Mon, 29 Nov 2021 18:33:05 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> This needs another hotspot reviewer to review before integration.
>
> @PaulSandoz Do we need another test run after the changes? If so, could you please help in running through your testing.

@sviswa7 re-running tests since there were some subtle changes in the code

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PR: https://git.openjdk.java.net/jdk/pull/6447