d3d12: Add a debug flag for loading WinPixGpuCapturer.dll
This is useful for apps with launchers. For arm64, due to a PIX issue, it's the only way to get PIX attached to an x64 app with an x64 launcher.
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This is useful for apps with launchers. For arm64, due to a PIX issue, it's the only way to get PIX attached to an x64 app with an x64 launcher.