b10299

metal : avoid threadgroup matrix array instantiation in kernel_lightning_indexer (#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.

Signed-off-by: JamePeng [email protected]

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