[llvm] [SimplifyCFG][Migrated] Transform for redirecting phis between unmergeable BB and SuccBB (PR #67275)

[via llvm-commits]

DianQK wrote:

> Sure, feel free to revert it. But the buildbot's log confuse me with something related to flang and SLPVectorizer. Could someone help me understand that?

If I understand correctly, this is an error that occurred in stage 2. First building clang (stage1) with an older version of clang and then building stage2 with this stage1 failed. The stage1 contains your optimization.
Trouble is, that these kinds of problems are hard to solve. If your optimization is safe, it may be exposing some other mis-compilation.

https://github.com/llvm/llvm-project/pull/67275