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

[kuaiwei]

On Tue, 5 Mar 2024 04:29:08 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> @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`
>
>> @dholmes-ora asked to disable warning by default and I agree.
> 
> What I said was that until all the known issues are resolved then the warning should be disabled. If this PR fixes every warning that has been spotted then that is fine - the warning can remain on to detect new problems creeping in. Otherwise issues should be filed to fix all remaining warnings and the warning disabled until they are all addressed. We have been lucky that these unexpected warnings have only caused minimal disruption to our builds.

> @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`

I added check of _disable_warnings in adlc. But not enable it in build script.

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PR Comment: https://git.openjdk.org/jdk/pull/18075#issuecomment-1978066503