metal : avoid `threadgroup` matrix array instantiation in kernel_lightning_indexer (llama/26646)
- In MSL, declaring an array of matrix types like `threadgroup half4x4` causes
a 'no matching constructor' compilation error because MSL matrix types do not
have zero-argument default constructors and threadgroup variables cannot have
initializers.
- Fix this by declaring a POD `threadgroup half` array instead and casting
to `threadgroup half4x4 *` for matrix indexing.
overview / pkg / ggml / sources / whisper.cpp / commit