[llvm] Revert "[LSV] Merge contiguous chains across scalar types" (PR #170381)

[Anshil Gandhi via llvm-commits]

gandhi56 wrote:

Hi @dakersnar, thanks for your comments. I am certainly open to improve the solution to this problem. I will approve this revert. Let's discuss in #97715.

https://github.com/llvm/llvm-project/pull/170381