dc969061c6
If there are multiple predecessors that have the same condition value (and thus same "real destination"), these were previously handled by copying the threaded block for each predecessor. Instead, we can reuse one block for all of them. This makes the behavior of SimplifyCFG's jump threading match that of the actual JumpThreading pass. This also avoids the infinite combine loop reported in: https://reviews.llvm.org/D124159#3624387