[foreign-memaccess+abi] RFR: Add benchmarks to MemorySegmentVsBits

[Uwe Schindler]

On Mon, 2 Jan 2023 10:25:17 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes the addition of some benchmarks, for example using a LonBuffer and a VarHandle.

By the way, the comment in the benchmark is wrong. The methods are in `java.io.Bits` not `java.nio.Bits`.

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PR: https://git.openjdk.org/panama-foreign/pull/762