[clang] [Clang][CodeGen][X86] don't coerce int128 into `{i64,i64}` for SysV-like ABIs (PR #135230)

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T0b1-iOS wrote:

Fixed. Thanks for the review! As I don't have commit access, could you merge this for me?. And do you think this could be put onto the 21 release branch? I think it should be possible from a policy pov but I think you need to have commit access to make a backport request if I'm reading the docs correctly.

https://github.com/llvm/llvm-project/pull/135230