RFR: 8327999: Remove copy of unused registers for cpu features check in x86_64 AVX2 Poly1305 implementation

[Sandhya Viswanathan]

On Tue, 12 Mar 2024 19:11:28 GMT, Srinivas Vamsi Parasa <duke at openjdk.org> wrote:

> The goal of this PR is to fix the bug reported in #17881 where data from unused registers (rbx, rcx, rdx) is being copied.

Marked as reviewed by sviswanathan (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18248#pullrequestreview-1934928567