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

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

There isn't any reason we can't do this... but it doesn't really solve the issue in general.  And there are a lot of other ways to trip over this.  CC @dblaike @hvdijk @jmorse 

Do we want to try to handle _BitInt, or a struct containing an i128?

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