[llvm] [AArch64] Lower mathlib call ldexp into fscale when sve is enabled (PR #67552)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

Thanks, this LGTM.

Do you have commit access, or should I hit commit? If so are you happy for this to go in?

https://github.com/llvm/llvm-project/pull/67552