llvm-project

87e6fd16 - [MLIR] Erase unreachable blocks before applying patterns in the greedy rewriter (#153957)

[MLIR] Erase unreachable blocks before applying patterns in the greedy rewriter (#153957) Operations like: %add = arith.addi %add, %add : i64 are legal in unreachable code. Unfortunately many patterns would be unsafe to apply on such IR and can lead to crashes or infinite loops. To avoid this we can remove unreachable blocks before attempting to apply patterns. We may have to do this also whenever the CFG is changed by a pattern, it is left up for future work right now. Fixes #153732