Fixing strings dialect compilation.
Fixing strings dialect compilation.

Closes https://github.com/google/iree/pull/1329

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/1329 from google:benvanik-fix-strings aca49ed59611a0f2709774a88104dda2e1338e61
PiperOrigin-RevId: 304090825

google/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree