Investigate the behavior difference in System.Runtime.Numeric when running on desktop

[tarekgh]

System.Runtime.Numeric has some different behaviors when running on desktop than when running on netcore. the PR dotnet/corefx#15050 has the places needed to be investigated which are marked with [SkipOnTargetFramework(TargetFrameworkMonikers.NetFramework)]

[tarekgh]

cc @mellinoe

[tarekgh]

The following case is giving different results on desktop too

        public static void RunDoubleExplicitCastFromLargeBigIntegerTests()
        {
            DoubleExplicitCastFromLargeBigIntegerTests(0, 4, 32, 3);
        }

System.Numerics.Tests.cast_fromTest.RunDoubleExplicitCastFromLargeBigIntegerTests [FAIL]
    Assert.Equal() Failure
    Expected: ∞
    Actual:   0

[tarekgh]

one more case:

        public static void RunLargeValueLogTests()
        {
            LargeValueLogTests(0, 4, 64, 3);
        }

  System.Numerics.Tests.logTest.RunLargeValueLogTests [FAIL]

        Assert.True() Failure
        Expected: True
        Actual:   False