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

[Ingo Müller via llvm-commits]

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+// RUN: mlir-opt %s
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ingomueller-net wrote:

#69190 already adds tests for all I could think of testing but feel free to add more if there's something I missed.

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