[llvm] [AMDGPU] narrow only on store to pow of 2 mem location (PR #150093)

[Robert Imschweiler via llvm-commits]

ro-i wrote:

> (Credit: @ro-i)

(Let's not forget @aengelke as the original source of this wisdom ^^)


https://github.com/llvm/llvm-project/pull/150093