RFR: 8326983: Unused operands reported after JDK-8326135 [v3]

[Vladimir Kozlov]

On Mon, 4 Mar 2024 11:12:04 GMT, kuaiwei <duke at openjdk.org> wrote:

>> Remove all unused operands reported by adlc. I'm testing x86_64 and aarch64. So far no failure found in tier1.
>> I tried to clean unused operands for all platform. A special case is immLRot2 in arm, it's not used, but appeared in many todo comments. So I keep it.
>
> kuaiwei has updated the pull request incrementally with one additional commit since the last revision:
> 
>   move no_rax_RegP from x86_64.ad to z_x86_64.ad and comment out immLRot2 in arm_32.ad

@dholmes-ora asked to disable warning by default and I agree.

We can use `AD._disable_warnings` flag to guard these warnings and add corresponding `-w` flag to `adlc` command in `GensrcAdlc.gmk`

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PR Comment: https://git.openjdk.org/jdk/pull/18075#issuecomment-1977152941