[llvm] [GlobalISel] Combine into abd[su] and legalize abd[su] (PR #118865)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

LLVM ERROR: cannot select: %18:gpr64(s64) = G_SADDLP %31:fpr (in function: recursive)

https://github.com/llvm/llvm-project/pull/118865