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

[Lei Huang via llvm-commits]

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+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux -mcpu=pwr7 \
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lei137 wrote:

You are right.  I verified that this pass even without this update to clang.  Will remove this IR test from the PR.

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