Engininja2

`__shfl_xor()` for half2 was added in ROCm 5.6. This PR implements it for HIP versions less than that. Fixes #7242

Fix half2 with HIP

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The current version of CUDA allows you to access the component halfs of half2 through half2.x and half2.y, but in HIP x and y are unsigned shorts and not half...

[Issue]: Windows HIP SDK CMake HIP language support not working

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### Problem Description When using Visual Studio 2022 CMake to compile a project (llama.cpp PR#5966) that uses `enable_language(HIP)` with the HIP 5.7 SDK I get the following error: ``` CMake...