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

[Hubert Tong via cfe-commits]

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+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux -mcpu=pwr7 \
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hubert-reinterpretcast wrote:

I am not sure the machine-codegen-from-IR test is necessary. We only changed the Clang front-end IR codegen. It stands to reason that this test would have passed even with none of the other changes from this patch.

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