RFR: 8329549: Remove FORMAT64_MODIFIER [v2]

[David Holmes]

On Tue, 7 Jan 2025 12:31:44 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The `_X` infix is meant to indicate `0x`. I think `UINT64_FORMAT_0` is what you are looking for.
>
> I thought X was hexadecimal.  That's a lot better.  Thanks.

// Guide to the suffixes used in the format specifiers for integers:
//        - print the decimal value:                   745565
//  _X    - print as hexadecimal, without leading 0s: 0x12345
//  _X_0  - print as hexadecimal, with leading 0s: 0x00012345

It wasn't obvious to me that the _X meant hexadecimal-with-0x-prefix versus simply hexadecimal. But I have no issue with always doing 0x :)

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PR Review Comment: https://git.openjdk.org/jdk/pull/22918#discussion_r1905429372