[llvm] [AArch64] Remove redundant FDIV Combine. (PR #91924)

[Sander de Smalen via llvm-commits]

sdesmalen-arm wrote:

> Can we just delete this transform? It's specifically checking for a divide by a power of two... but instcombine always transforms that to a multiply, so this will basically never trigger.

Good point! I've repurposed the PR to instead remove the combine.

https://github.com/llvm/llvm-project/pull/91924