[TableGen] Introduce a less aggressive suppression for HwMode Decoder…

[superZWT123]

1. Remove 'AllModes' and 'DefaultMode' suffixes for DecoderTables under default HwMode.
2. Introduce a less aggressive suppression for HwMode DecoderTable, only reduce necessary tables duplications. This allows encodings under different HwModes to retain the original DecoderNamespace.
3. Change 'suppress-per-hwmode-duplicates' command option from bool type to enum type, allowing users to choose what level of suppression to use.

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✅ With the latest revision this PR passed the C/C++ code formatter.

[superZWT123]

Hi kparzysz, nvjle ，following the discussion on the previous pull request pre-pull-request, I have changed the type of ‘suppress-per-hwmode-duplicates’ from 'bool' to 'enum', allowing users to choose the degree of table suppression they prefer. Could you please take another look at it and provide your review comments ? Thanks a lot!

[superZWT123]

Perhaps I should use the '@'. I couldn’t add reviewers, so I’m not sure if my previous message notified you~ @nvjle @kparzysz

[nvjle]

Perhaps I should use the '@'. I couldn’t add reviewers, so I’m not sure if my previous message notified you~ @nvjle @kparzysz

Hi @superZWT123,
I just saw this PR now that you added the @. Until you have github commit access, you won't be able to use the ordinary Reviewers pull down menu yet. I will re-review this iteration of the patch soon.

[superZWT123]

Perhaps I should use the '@'. I couldn’t add reviewers, so I’m not sure if my previous message notified you~ @nvjle @kparzysz

Hi @superZWT123, I just saw this PR now that you added the @. Until you have github commit access, you won't be able to use the ordinary Reviewers pull down menu yet. I will re-review this iteration of the patch soon.

Thank you, nvjle .

[superZWT123]

Hi @nvjle , I hope this message finds you well. I want to kindly remind you about the pending review of the code we discussed. The completion of this part is crucial as the remaining fixing for 'EncodingByHwMode' are dependent on it. I understand and appreciate the time and effort it takes to review code, and I hope we can expedite this process to keep the project moving forward smoothly.

[superZWT123]

Hi, @topperc,
Could you help review this PR? The logic of this part of the code is relatively simple, and we have had extensive discussions on it before. I have another fix related to ‘EncodingByHwMode’ that I plan to submit after this one is finalized. I tested my fix on RISCV, enabling ‘EncodingByHwMode’, and everything works as expected. The adaptation required from users to utilize ‘EncodingByHwMode’ is minimal. After this PR is concluded, I will also submit a simple example for RISCV as a reference. Thank you very much!
RFC:https://discourse.llvm.org/t/rfc-fix-tablegen-for-hwmode/77625
PRE-PR(The last three comments are discussions about this pr.):#84906

[topperc]

LGTM

[superZWT123]

LGTM

Hi @topperc , could you please help me merge this PR into the main branch? I’m not a committer and don’t have write access to this repository. Thank you very much!

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