RFR: 8343824: Remove unused InstructionFlags in C1

[Thomas Schatzl]

On Fri, 8 Nov 2024 17:46:49 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this change that removes unused/unreferenced flags from the `Instruction::InstructionFlag` enum for the C1 compiler.
>> 
>> Testing: gha, tier1-3
>> 
>> Thanks,
>>   Thomas
>
> @tschatzl do you know history of these flags and why they are not used?

Thanks @vnkozlov @dean-long for your reviews. Thanks for the additional archeology information.

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PR Comment: https://git.openjdk.org/jdk/pull/21973#issuecomment-2467603389