[llvm] [mlir][Transform] Create a transform interpreter and a preloader pass (PR #68661)

[Nicolas Vasilache via llvm-commits]

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+// RUN: mlir-opt %s
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nicolasvasilache wrote:

seems I made a mistake and erased the relevant file when renaming indeed, thanks for noticing!
I'll add the missing test file tomorrow and report back here.

https://github.com/llvm/llvm-project/pull/68661