[llvm] [SimplifyCFG] Enable sinking instructions with differing alignments (PR #215858)

[Sayan Sivakumaran via llvm-commits]

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sivakusayan wrote:

These two tests seem to pass independent of `target triple` and `target datalayout` information, along with many other tests in this file. But it seems this is where most of our sinking tests go, so I just added onto it.

Maybe a good NFC patch would be to factor out sinking tests that don't need target-specific information?

https://github.com/llvm/llvm-project/pull/215858