[llvm] [AArch64][GlobalISel] Add `G_FMODF` instruction (PR #160061)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Can you add a global-isel run line for the tests in llvm/test/CodeGen/AArch64/llvm.modf.ll too?

https://github.com/llvm/llvm-project/pull/160061