[WIP][fix]Segfault in TensorRT 10.13.3 ONNX parser #4586 #4602
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LiangHuDream
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Initialize IHostMemory::mImpl to nullptr and add null checks in IHostMemory accessors.
Add null checks in IDimensionExpr and IExprBuilder accessor methods so they return safe defaults (false/INT64_MIN/nullptr) when mImpl is null.
These are minimal safety guards to reduce the chance of segfaults when objects with missing mImpl are encountered (e.g., during ONNX parsing paths).