[Mlir-commits] [mlir] Revert "[mlir][vector] Migrate drop-lead-unit-dim to shape_cast #196206" (PR #199546)

[Leandro Lupori]

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

Since many bots are broken, let's revert it for now.

https://github.com/llvm/llvm-project/pull/199546