[llvm] [NFC][IR2Vec] Removing Dimension from `Embedder::Create` (PR #142486)

[S. VenkataKeerthy via llvm-commits]

svkeerthy wrote:

### Merge activity

* **Jun 2, 10:03 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/142486).


https://github.com/llvm/llvm-project/pull/142486