[llvm] [DAG][X86] Avoid slow masked-store folds on Zen (PR #214187)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> @RKSimon can we add this flag to `-x86-64-v3` as well? This will significantly help Zen subtargets which regress as mentioned in issue #213195
> 
> cc @phoebewang

Sounds good to me. We tend to tune for the worest one.

https://github.com/llvm/llvm-project/pull/214187