llvm-project

ea7ff48c - [DominanceFrontier] Support multiple root nodes for post-dom (#181257)

[DominanceFrontier] Support multiple root nodes for post-dom (#181257) Post-dominator tree has a notion of a single virtual root node, use that in the dominance-frontier implementation to support multiple root nodes. Originally part of https://github.com/llvm/llvm-project/pull/179336 but split up into a separate later PR to ease review. --------- Co-authored-by: Luke Lau <luke_lau@icloud.com>