[foreign-memaccess+abi] RFR: Add benchmark [v3]

[Uwe Schindler]

On Mon, 19 Dec 2022 11:59:44 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposed to add a new benchmark outlining potential performance gains with the FFM API in internal JDK classes.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add case for singel invocation

test/micro/org/openjdk/bench/java/lang/foreign/MemorySegmentVsBits.java line 131:

> 129:     }
> 130: 
> 131:     static long getLong(byte[] b, int off) {

this method is unused.

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PR: https://git.openjdk.org/panama-foreign/pull/761