[llvm] Add an all-in-one histogram intrinsic, along with lowering for AArch64 (PR #88106)

[via llvm-commits]

RonDahan101 wrote:

This is a great improvement! I would be glad if you could consider supporting these two cases as well:
* Histograms with saturated values.
* More operations instead of only 'add' (Min/Max/Set).

https://github.com/llvm/llvm-project/pull/88106