[llvm] [X86][CostModel] Add per-shape gather/scatter cost tables for AMD znver4+ (PR #199488)

[Sumukh J Bharadwaj via llvm-commits]

amd-subharad wrote:

> I'd like to add that the znver4 scheduler model has no gather/scatter overrides at all - that might be a better place to start.

The schedule model would certainly be the right long term move for this data, and we are planning to work towards it.
We will follow the process to incorporate the GS costs in the scheduler model for znver4/5 and then to utilize it for the TTI calls. Would that be adequate?
Thank you

https://github.com/llvm/llvm-project/pull/199488