[llvm] [AArch64] Fix #94909: Optimize vector fmul(sitofp(x), 0.5) -> scvtf(x, 2) (PR #141480)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Thanks for adding all the tests, that's fantastic. I have a suggestion to make the code slightly more structured in case something happens with weird node types, but it LGTM otherwise.

https://github.com/llvm/llvm-project/pull/141480