llvm-project

79f41434 - [mlir][Transforms] Dialect conversion: Move `hasRewrite` to expensive checks (#119848)

[mlir][Transforms] Dialect conversion: Move `hasRewrite` to expensive checks (#119848) The dialect conversion has various checks that detect incorrect API usage in patterns. One of these checks turned out to be quite expensive (N*M complexity where N is the number of block rewrites and M is the total number of rewrites) in NVIDIA-internal workloads: Checking that a block is not converted multiple times. This check iterates over the stack of all rewrites, which can be large. We saw `hasRewrite` being called around 45000 times with an average rewrite stack size of 500000. This PR moves the check to `MLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS`. For consistency reasons, the other `hasRewrite`-based check is also moved there.