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Nicolas Vasilache d12d05a731 [mlir][Linalg] Introduce a helper function for staged pattern application

Summary:
This revision introduces a helper function to allow applying rewrite patterns, interleaved with more global transformations, in a staged fashion:
1. the first stage consists of an OwningRewritePatternList. The RewritePattern in this list are applied once and in order.
2. the second stage consists of a single OwningRewritePattern that is applied greedily until convergence.
3. the third stage consists of applying a lambda, generally used for non-local transformation effects.

This allows creating custom fused transformations where patterns can be ordered and applied at a finer granularity than a sequence of traditional compiler passes.

A test that exercises these behaviors is added.

Differential Revision: https://reviews.llvm.org/D79518

2020-05-11 16:46:30 -04:00