[llvm] [DAG] Reducing instructions by better legalization handling of AVGFLOORU for illegal data types (PR #99913)

[Craig Topper via llvm-commits]

topperc wrote:

@medievalghoul I pushed this, but then I started getting build bot errors failing llvm/test/CodeGen/AArch64/avgflooru-i128.ll so I reverted to get the bots back to green.

https://github.com/llvm/llvm-project/pull/99913