[llvm] [BranchFolding] Add an option to tail merge only bbs without successors (PR #101969)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

Thanks! Please add a test at least and provide some data about code size reduction on llvm-testsuite (or other benchmarks).

https://github.com/llvm/llvm-project/pull/101969