[llvm] [IR] Check identical alignment for atomic instructions (PR #155349)

[Ellis Hoag via llvm-commits]

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ellishg wrote:

I ended up removing the tests I added. I didn't want to translate the existing tests to LIT because I thought that was the beyond the scope of this PR, but I did add a TODO comment. I'll land this Monday if there are no other concerns.

https://github.com/llvm/llvm-project/pull/155349