[llvm] [LSV] Merge contiguous chains across scalar types (PR #154069)

[Drew Kersnar via llvm-commits]

dakersnar wrote:

Unless I am mistaken, I think there are a number of correctness issues in this change, in addition to some less important style issues. I think we may need to revert and rethink this change. I can come up with correctness-issue-demonstrating test examples soon if you would like.

https://github.com/llvm/llvm-project/pull/154069