Only traverse reachable blocks in JumpThreading. Fixes https://github.com/rust-lang/rust/issues/131451 We only compute loop headers for reachable blocks. We shouldn't try to perform an opt on unreachable blocks anyway.
Only traverse reachable blocks in JumpThreading. Fixes https://github.com/rust-lang/rust/issues/131451 We only compute loop headers for reachable blocks. We shouldn't try to perform an opt on unreachable blocks anyway.