[compiler-rt] [llvm] [mlir] [polly] [clang] [libc] [libcxx] [openmp] [lldb] [C API] Add support for setting/getting new nneg flag on zext instructions (PR #73592)

[Benji Smith via cfe-commits]

Benjins wrote:

Bumping this: if it's good to land, can someone with write access merge it?

https://github.com/llvm/llvm-project/pull/73592