onnxruntime

7e0ee2bb - Add CMake option to enable saturation checker for ConvSymKernelAvx2 (#24220)

Add CMake option to enable saturation checker for ConvSymKernelAvx2 (#24220) ### Description <!-- Describe your changes. --> This PR adds a new CMake option: onnxruntime_ENABLE_CONVSYMKERNELAVX2_SAT_CHECKER. When enabled, this option activates a saturation checker for the VPMADDUBSW instruction used in the ConvSymKernelAvx2 path. The checker works by calling a helper function before each VPMADDUBSW instruction. This function simulates the computation using C++ and intrinsics with higher-precision types (int32_t) to detect whether the result exceeds the bounds of int16_t (i.e., greater than INT16_MAX or less than INT16_MIN). By default, the checker logs a warning only once per inference session. However, the logic can be easily extended to print more frequently if needed. Developers can also reuse this pattern to implement similar saturation checks for other instructions. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> On some models running with AVX2 (instead of AVX-VNNI), we've observed accuracy degradation due to saturation in vectorized instructions. This saturation checker provides a way to debug and detect those cases by reporting potential overflow in intermediate computations.