[mlir][Transforms] GreedyPatternRewriteDriver debugging: Detect faulty patterns
Compute operation finger prints to detect incorrect API usage in RewritePatterns. Does not work for dialect conversion patterns.
Detect patterns that:
* Returned `failure` but changed the IR.
* Returned `success` but did not change the IR.
* Inserted/removed/modified ops, bypassing the rewriter. Not all cases are detected.
These new checks are quite expensive, so they are only enabled with `-DMLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS=ON`. Failures manifest as fatal errors (`llvm::report_fatal_error`) or crashes (accessing deallocated memory). To get better debugging information, run `mlir-opt -debug` (to see which pattern is broken) with ASAN (to see where memory was deallocated).
Differential Revision: https://reviews.llvm.org/D144552