RFR: 8361582: AArch64: Some ConH values cannot be replicated with SVE [v6]

[Bhavana Kilambi]

On Fri, 15 Aug 2025 09:46:43 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Thanks for letting me know about the optimization on Apple. After consulting the Software optimization guide, it looks like a `mov w, #0` is also a zero cycle move along with the `movw w, zr` instruction on V1/N2/V2 and is a normal ALU op on N1. Makes sense to eliminate the instruction. I will make the changes you suggested in next PS.
>
> Thanks. I know from personal experience that it's hard to resist every tiny optimization, but some things aren't worth it.

Could you please take another look at the patch? Thanks!

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PR Review Comment: https://git.openjdk.org/jdk/pull/26589#discussion_r2278860766