RFR: 8337563: NMT: rename MEMFLAGS to MemFlag

[Kim Barrett]

On Fri, 30 Aug 2024 07:18:47 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> [...] And the enum values would have to be in that namespace in any case, so we wont get around having to qualify all "mtXXX" flags NMT::mtXXX.

We already have to solve essentially that problem because its now a scoped enum.  We currently define synonym
constants at global scope.  (C++20 provides `using MEMFLAGS;`.) Otherwise, we'd currently be needing
MEMFLAGS::mtXXX.

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PR Comment: https://git.openjdk.org/jdk/pull/20497#issuecomment-2320702002