RFR: 8337563: NMT: rename MEMFLAGS to MemTag [v7]

[Gerard Ziemski]

On Tue, 10 Sep 2024 20:53:46 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

>> Please review this cleanup, where we rename `MEMFLAGS` to `MemTag`.
>> 
>> `MEMFLAGS` implies that we can use more than one at the same time, but those are exclusive values, so `MemTag` is a more suitable name.
>> 
>> This fix also includes a cleanup of all the related parameter names and local variable names.
>> 
>> Testing is pending...
>> 
>> Note: there is more history in old closed PRs [https://github.com/openjdk/jdk/pull/20497](https://github.com/openjdk/jdk/pull/20497) and [https://github.com/openjdk/jdk/pull/20472](https://github.com/openjdk/jdk/pull/20472)
>
> Gerard Ziemski has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Coleen's feedback

I went with `MT` throughout the code for all MemTag template parameter names. It will be a nice mental shortcut once we get used to the change...

I did not want to rock the boat too much and decided  not to use `mem_tag` for template parameter names, it just did not look good next to the other names, with all capital letters.

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PR Comment: https://git.openjdk.org/jdk/pull/20872#issuecomment-2341992426