* Fix a bug introduced by the Chipset refactoring in #107720 where
atomics emulation for adds was mistakenly applied to gfx11+
* Add the case needed for gfx11+ atomic emulation, namely that gfx11
doesn't support atomically adding a v2f16 or v2bf16, thus requiring
MLIR-level legalization for buffer intrinsics that attempt to do such an
addition
* Add tests, including tests for gfx11 atomic emulation
Co-authored-by: Manupa Karunaratne <manupa.karunaratne@amd.com>
9596e83b2a