[llvm] [AArch64] Extend int-to-fp load optimization to support f16 (PR #168076)

[David Green via llvm-commits]

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

Im not sure we should have two ways of doing this - I think the bitcast in DAG might be able to handle both of them now.

With as we have things this LGTM though. Thanks

https://github.com/llvm/llvm-project/pull/168076