[llvm] [InstCombine] Make `(binop ({s|u}itofp),({s|u}itofp))` transform more flexible to mismatched signs (PR #84389)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Could you please have a look at https://github.com/dtcxzyw/llvm-opt-benchmark/pull/336#discussion_r1517575694?


https://github.com/llvm/llvm-project/pull/84389