[clang] [llvm] [PowerPC] Fix codegen for transparent_union function params (PR #101738)

[Lei Huang via cfe-commits]

lei137 wrote:

> I'm not an expert here, but I think the change you made makes sense since the `Ty` is supposed to be the first field.
> 
> Also, might be a dumb question, I saw we have 32-bit Linux run lines, but is that still worth testing?

Thanks for taking a look @amy-kwan.  The 32bit linux run line was added in response to review comment from Hubert: https://github.com/llvm/llvm-project/pull/101738#issuecomment-2268003106

https://github.com/llvm/llvm-project/pull/101738