[clang] [llvm] [HLSL] Handle WaveActiveBallot struct return type appropriately (PR #175105)

[Farzon Lotfi via cfe-commits]

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+; RUN: opt -S -scalarizer -mtriple=dxil-pc-shadermodel6.3-library < %s | FileCheck %s
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farzonl wrote:

Why do you need a new file for this? I’m pretty sure your change should not impact the scalarizer so adding a second run line to the existing directx backend test should have been enough to address Finn’s concerns.

https://github.com/llvm/llvm-project/pull/175105