RFR: 8297534: Specify the size of MEMFLAGS [v2]

[Thomas Stuefe]

On Thu, 24 Nov 2022 21:21:13 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> > Hmm, I can live with that, though I would have preferred the raw type for clarity. After all, enum should follow the layout of the header, not the other way around.
> > Can you at least add a static assert that sizeof memflags is 8 bits?
> 
> Absolutely. Would you like that right after the definition of MEMFLAGS then? (and not after the definition of `MEMFLAGS _flags` in the header)

I don't care much as long as it explodes when MEMFLAGS are changed :-) If you add it to the hpp file, you need to give it debug.hpp too. I leave it up to you.

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PR: https://git.openjdk.org/jdk/pull/11336