[llvm] [mlir][bufferization][NFC] Rename copy_tensor op to materialize_in_destination (PR #65467)

[Martin Erhart via llvm-commits]

https://github.com/maerhart commented:

Do I understand correctly that this is not just renaming but also relaxing the guarantees the op provides (guaranteed to lower to a memcpy vs only lowers to a memcpy if needed)?
I assume there are no users of this op that relied on the guarantee of it to lower to a memcpy?

https://github.com/llvm/llvm-project/pull/65467