RFR: 8367706: Remove redundant register used by cmove in C1 LIR generation [v2]

[Dean Long]

On Wed, 17 Sep 2025 02:47:21 GMT, lusou-zhangquan <duke at openjdk.org> wrote:

>> This PR removes redundant temp register used by cmove in C1 LIRGenerator::do_LookupSwitch and LIRGenerator::do_TableSwitch. The issue [8367706](https://bugs.openjdk.org/browse/JDK-8367706) is reported by me and it's my pleasure to fix it.
>
> lusou-zhangquan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix wrong source register order

Marked as reviewed by dlong (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27307#pullrequestreview-3232502452