[llvm] [llvm-mca] Add command line option `-use-load-latency` (PR #94566)

[Chinmay Deshpande via llvm-commits]

chinmaydd wrote:

@michaelmaitland and @adibiagio - thank you very much for your time and useful comments. I think I understand the fundamental problems with this patch. 

It may make sense for a consumer of llvm-mca (looking to more precisely model latency counts for load instructions) to define custom HW units, such as the LSUnit and something like a CacheManager, tuned to their specific processor.

Closing the PR, thanks again !

https://github.com/llvm/llvm-project/pull/94566