RFR: 8295012: Arena should not derive from CHeapObj<mtNone> [v2]

[Stefan Karlsson]

On Tue, 11 Oct 2022 05:17:40 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
>
> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Arena derives from CHeapObjBase

Marked as reviewed by stefank (Reviewer).

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