RFR: 8257074 Update the ByteBuffers micro benchmark [v4]

[Chris Hegarty]

On Mon, 30 Nov 2020 20:54:09 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Chris Hegarty has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Add explicitly allocated heap carrier buffer tests
>>  - Replace Single with Loop
>
> Marked as reviewed by bpb (Reviewer).

While the updated set of scenarios covered by this benchmark is
reasonably (and vastly improves coverage), I find myself reluctant to
add the last remaining buffer property - read-only views. It's time to
template the generation of this code!

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PR: https://git.openjdk.java.net/jdk/pull/1430