Integrate LLVM at llvm/llvm-project@bb993b1d9de3
Integrate LLVM at llvm/llvm-project@bb993b1d9de3

Updates LLVM usage to match
[bb993b1d9de3](https://github.com/llvm/llvm-project/commit/bb993b1d9de3)

PiperOrigin-RevId: 345083620

google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree