This patch improves the lowering for BranchOnTwoConds added in
https://github.com/llvm/llvm-project/pull/172750 by replacing the branch
on OR with a chain of 2 branches.
On Apple M cores, the new lowering is ~8-10% faster for std::find-like
loops. It also makes it easier to determine the early exits in VPlan. I
am also planning on extensions to support loops with multiple early
exits and early-exits at different positions, which should also be
slightly easier to do with the new representation.
PR: https://github.com/llvm/llvm-project/pull/174016
4a807e8dd9