message: Update comment on xla::HloDCE to reflect that it does remove dead computations.
diff: @@ -24,10 +24,15 @@ limitations under the License.
  namespace xla {
  -// HLO pass which removes all dead instructions from each computation in the
  -// module. An instruction is dead if it is not reachable from the root. This
  -// pass does not remove dead parameter instructions as parameter instructions
  -// cannot be deleted, nor does the pass remove dead computations.
  +// HLO pass which removes dead instructions from each computation in the module
  +// and removes dead computations from the module.
  +//
  +// An instruction is dead if it is not reachable from the root. A computation is
  +// dead if it is not the entry computation of the module and it is not reachable
  +// from the entry computation.
  +//
  +// This pass does not remove dead parameter instructions, as parameter
  +// instructions cannot be deleted.
  class HloDCE : public HloPassInterface {
  public:
  ~HloDCE() override {}
  