Vulkan: Use improved q4_k and q5_k dequant code in dequant shaders #10798
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LGTM. I won't have time to test it today, but please go ahead.
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I ported the q4_k and q5_k GLSL optimizations to the dequant shaders, this means the backend does not trigger the shader compile error on Qualcomm Adreno devices anymore (see #5186).