Stabilize hex_literal_case

[tapanprakasht]

Stabilizing hex_literal_case
This PR try to address the issue #5081

[ytmimi]

Thanks for adding these negative value tests. Int literals can also be written with a _{type} suffixes like _u32. Just to cover all the bases I think we should add some test cases with those kinds of suffixes.

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[ytmimi]

Thanks for trying to get this option stabilized. I think hex_literal_case is a good candidate for stabilization. I don't see any bugs in the backlog, and I assume that it's being used by projects out in the wild, but we should try to confirm if there's a good amount of real world usage.

Also, For consistency with other config options, Let's move all of these tests to tests/{source|target}/configs/hex_literal_case

@rustbot author

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[rustbot]

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