[llvm] [X86] Add correct model values for masked stores on Zen 1 and 2 (PR #217254)

[Rohan Shenoy via llvm-commits]

222rohan wrote:

Apologies, the bot added wrong labels + added @nikic as a reviewer due to touches in InstCombine. Fixed now. Could you pls remove the labels and Reviewer
ping @RKSimon 

https://github.com/llvm/llvm-project/pull/217254