llvm-project

204eb70a - [mlir][Vector] Canonicalize empty `vector.mask` into `arith.select` (#140976)

[mlir][Vector] Canonicalize empty `vector.mask` into `arith.select` (#140976) This PR adds a missing canonicalization for empty `vector.mask` ops with a passthru value. ``` %0 = vector.mask %mask, %passthru { vector.yield %a : vector<8xf32> } : vector<8xi1> -> vector<8xf32> becomes: %0 = arith.select %mask, %a, %passthru : vector<8xf32> ```