[llvm] [GlobalISel][AArch64][AMDGPU] Expand FPOWI into series of multiplication (PR #95217)

[via llvm-commits]

isuckatcs wrote:

I addressed all the comments on the PR. Is there anything else I could do to improve it, or can we merge it in this state?

https://github.com/llvm/llvm-project/pull/95217