llvm-project

b014265d - [mlir][AMDGPU] New gfx12 barrier instructions and update lowering LDSBarrierOp (#109273)

[mlir][AMDGPU] New gfx12 barrier instructions and update lowering LDSBarrierOp (#109273) New gfx12 barrier instructions: s.barrier.signal, s.barrier.wait and s.wait.dscnt. And update lowering LDSBarrierOp accordingly. CC: @krzysz00 @manupak @giuseros