intel / intel/mlir-extensions

[XeGPU] SLM support for scattered tensors.

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Description

Currently, scattered tensors in slm are not supported for load/store ops:
```#xegpu.tdesc_attr>```
They can only load/store to global memory (ugm), as indicated by the hardcoded `sfid` argument of the intrinsic call which is set to 15. Changing it to 14 should allow loads/stores to be performed upon shared local memory (slm).

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