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manager. While this has some utility for debugging and testing on its own, it is primarily intended to demonstrate the technique for adding custom wrappers that can provide more interesting interation behavior in a nice, orthogonal, and composable layer. Being able to write these kinds of very dynamic and customized controls for running passes was one of the motivating use cases of the new pass manager design, and this gives a hint at how they might look. The actual logic is tiny here, and most of this is just wiring in the pipeline parsing so that this can be widely used. I'm adding this now to show the wiring without a lot of business logic. This is a precursor patch for showing how a "iterate up to N times as long as we devirtualize a call" utility can be added as a separable and composable component along side the CGSCC pass management. Differential Revision: https://reviews.llvm.org/D22405 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277581 91177308-0d34-0410-b5e6-96231b3b80d8
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