[llvm] [JumpThreading] Thread over BB with only an unconditional branch (PR #86312)

[Nikita Popov via llvm-commits]

nikic wrote:

This seems to cause a 0.15% compile-time regression using stage2 clang only (https://llvm-compile-time-tracker.com/compare.php?from=1120d8e6f799121b611aa23bdc128e40cf9c6c58&to=36b3c26451bf9a42f0b6b415993d3942bb73abdd&stat=instructions:u), which indicates that causes an optimization regression, at least for clang :(

https://github.com/llvm/llvm-project/pull/86312