[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:

Also since we never added this function to isScalarizable  the comments for this test make no sense.  The scalarizer pass should not touch this intrinsic.

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