[MLIR] Add ReturnLike trait to memref.atomic_yield

Without this, the yield isn't considered as the region terminator and
the dataflow framework does not consider it live.

Author: joker-eph

mlir/include/mlir/Dialect/MemRef/IR/MemRefOps.td

@@ -1078,8 +1078,7 @@ def GenericAtomicRMWOp : MemRef_Op<"generic_atomic_rmw", [
 
 def AtomicYieldOp : MemRef_Op<"atomic_yield", [
       HasParent<"GenericAtomicRMWOp">,
-      Pure,
-      Terminator
+      Pure, Terminator, ReturnLike
     ]> {
   let summary = "yield operation for GenericAtomicRMWOp";
   let description = [{

mlir/test/Transforms/remove-dead-values.mlir

@@ -510,3 +510,18 @@ module {
 // CHECK: %[[yield:.*]] = arith.addf %{{.*}}, %{{.*}} : f32
 // CHECK: linalg.yield %[[yield]] : f32
 // CHECK-NOT: arith.subf
+
+// -----
+
+// CHECK-LABEL: func.func @test_atomic_yield
+func.func @test_atomic_yield(%I: memref<10xf32>, %idx : index) {
+  // CHECK: memref.generic_atomic_rmw
+  %x = memref.generic_atomic_rmw %I[%idx] : memref<10xf32> {
+  ^bb0(%current_value : f32):
+  // CHECK: arith.constant
+    %c1 = arith.constant 1.0 : f32
+  // CHECK: memref.atomic_yield
+    memref.atomic_yield %c1 : f32
+  }
+  func.return
+}