Add test case for dynamic-update-slice into constant (#6189)
Add test case for dynamic-update-slice into constant (#6189)

Thanks to Lei's https://github.com/google/iree/pull/6174, updating into
a constant now works.

Confirmed that before that commit, this test case reproduces the issue I
was hitting in https://github.com/google/iree/issues/5989.

Fixes https://github.com/google/iree/issues/5989
iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree