[llvm] [CodeGenPrepare] Return false in AddressingModeMatcher::matchOperationAddr if zext has nneg flag (PR #72098)

[Nikita Popov via llvm-commits]

nikic wrote:

I've proposed a possible alternative at https://github.com/llvm/llvm-project/pull/72103. Instead of dropping the flag, we can avoid reusing the instruction in the first place.

https://github.com/llvm/llvm-project/pull/72098