Stop recursive calculations in polynomial kernels if tensor has NaNs

[Silv3S]

Fixes #1823

[Copilot]

Pull Request Overview

This PR fixes infinite loops in polynomial kernel calculations when NaN values are encountered by adding early termination conditions. The fix prevents the kernels from hanging when computing Hermite, Laguerre, and Legendre polynomials with NaN inputs.

Key changes:

• Added NaN checks to loop conditions in polynomial kernel implementations
• Removed corresponding test skip entries that were previously failing due to hangs

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/xpu/skip_list_common.py	Removed skip entries for polynomial tests that previously hung
src/ATen/native/xpu/sycl/LegendrePolynomialPKernel.cpp	Added NaN check to prevent infinite loop in Legendre polynomial calculation
src/ATen/native/xpu/sycl/LaguerrePolynomialLKernel.cpp	Added NaN check to prevent infinite loop in Laguerre polynomial calculation
src/ATen/native/xpu/sycl/HermitePolynomialHeKernel.cpp	Added NaN check to prevent infinite loop in Hermite He polynomial calculation
src/ATen/native/xpu/sycl/HermitePolynomialHKernel.cpp	Added NaN check to prevent infinite loop in Hermite H polynomial calculation

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