RFR: 8343933: Add a MemorySegment::fill benchmark with varying sizes

[Francesco Nigro]

On Mon, 11 Nov 2024 11:55:27 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to add a new `MemorySegment::fill" benchmark where the byte size of the segments varies.

Thanks @minborg for this :) Please remember to add the misprediction count if you can - or just avoid the bulk methods instead i.e. having a `nextMemorySegment()` benchmark method which make the fill to observe the different segments.

Having separate call-sites which observe always the same type(s) "could" be too lucky (and gentle) for the runtime (and its CHA)

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PR Comment: https://git.openjdk.org/jdk/pull/22010#issuecomment-2468247252