[clang] [llvm] [mlir] [AMDGPU] fix alignment of i128 (PR #213523)

[Simeon David Schaub via cfe-commits]

simeonschaub wrote:

That seems like a potentially much larger change though and I'm a little afraid that it might break other things. Would it make sense to go with this more contained fix for now and discuss the datalayout defaults separately?

https://github.com/llvm/llvm-project/pull/213523