workaround for a VC++ bug in VS 17.14 (#24878)
The following unit tests failed when building ONNX Runtime with Visual Studio 17.14 in Release or RelWithDebInfo configuration.
- SparseTensorConversionTests.TestDenseToSparseConversion
- MeanVarianceNormalizationTest.AllAxes
- MVNContribOpTest.MeanVarianceNormalizationCPUTest_Version1_TO_8
This PR provides a workaround for the two MVN tests.
