[llvm] [SDag] Fold saddo[_carry] with bitwise-not argument to ssubo[_carry] (PR #66571)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

For the second live example I had to add --disable-undef-input because otherwise I get this: https://alive2.llvm.org/ce/z/QoHVCH
I'm not sure this it is OK.


https://github.com/llvm/llvm-project/pull/66571