RFR: 8295012: Arena should not derive from CHeapObj<mtNone>

[Stefan Karlsson]

On Sun, 9 Oct 2022 00:21:18 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to the `Arena` class.  Rather than deriving from
> `CHeapObj<mtNone>` (which has the effect of preventing C-heap allocation for an
> arena by asserting if such is attempted), instead have no allocation base
> class so that `new Arena(...)` will fail to compile.
> 
> Testing: mach5 tier1

What's the reason for keeping the new/delete operators in Arena, instead of inheriting from the newly introduced CHeapObjBase class?

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PR: https://git.openjdk.org/jdk/pull/10621