RFR: 8337563: NMT: rename MEMFLAGS to MemTag

[Coleen Phillimore]

On Sat, 7 Sep 2024 05:27:12 GMT, Kim Barrett <kbarrett 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)
>
> src/hotspot/share/utilities/chunkedList.hpp line 31:
> 
>> 29: #include "utilities/debug.hpp"
>> 30: 
>> 31: template <class T, MemTag F> class ChunkedList : public CHeapObj<F> {
> 
> Parameter name should be updated.  Suggest `mem_tag`.

How about MT here or just M?  I would make this a further change though.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20872#discussion_r1750281203