[Mlir-commits] [mlir] [mlir][vector][nfc] Add a test case for scalable vectors (PR #76138)

[Benjamin Maxwell]

https://github.com/MacDue approved this pull request.

LGTM, though `vector<[64]x64xf32>` is a bit of a weird type :) 

https://github.com/llvm/llvm-project/pull/76138