[llvm] [AArch64][GlobalISel] Ignore non-FPR truncating stores in manual selection code (PR #177190)

[Cullen Rhodes via llvm-commits]

c-rhodes wrote:

> Was this fixed by #175810, or can it trigger in a different way with that change? It seems similar to #171100, which led to changing how some GPR loads/stores are legalized and might have prevented this code from going wrong.
> 
> I was planning to look through the other opcodes (like indexed loads/stores) and see it any of this code can be cleaned up.

looks like #175810 fixed it: https://godbolt.org/z/vK3sr9xvd

I can update this just to contribute the reproducer?

https://github.com/llvm/llvm-project/pull/177190