[XLA:SPMD] Fix pad masking again

PiperOrigin-RevId: 367527318
Change-Id: Ie3599df55d259abff1e1260db849e34a9399c895

Author: ukoxyz

tensorflow/compiler/xla/service/spmd/spmd_partitioner.cc

@@ -2681,7 +2681,8 @@ Status SpmdPartitioningVisitor::HandlePad(HloInstruction* hlo) {
     dim->set_padding_high(pd.edge_padding_high());
     dim->set_base_dilation(pd.interior_padding() + 1);
     needs_masking |= hlo->sharding().tile_assignment().dim(i) > 1 &&
-                     (pd.edge_padding_low() < 0 || pd.edge_padding_high() < 0);
+                     (pd.edge_padding_low() > 0 || pd.edge_padding_high() > 0 ||
+                      pd.interior_padding() > 0);
   }
 
   auto replicated_rhs = GetPartitionedHlo(hlo->operand(1))

tensorflow/compiler/xla/service/spmd/spmd_partitioner_test.cc

@@ -2122,7 +2122,7 @@ ENTRY entry {
             op::Concatenate(param0, op::CollectivePermute(op::Slice(param0))));
   auto pad = AllOf(op::Shape("f32[14,131]"),
                    op::Pad(after_halo_exchange, op::Constant()));
-  EXPECT_THAT(root, op::DynamicSlice(pad, op::Constant(), _));
+  EXPECT_THAT(root, op::Select(_, op::DynamicSlice(pad, op::Constant(), _), _));
 }
 
 TEST_F(SpmdPartitioningTest, PadAlongPartitionedDimensionWithInteriorPadding) {