Fix AssertionDsc::Equals OAK_NO_THROW's handling

Fix AssertionDsc::Equals OAK_NO_THROW's handling

op2 of a OAK_NO_THROW assertions is O2K_INVALID and HasSameOp2 always returns false for O2K_INVALID. As a result OAK_NO_THROW assertions always compare unequal and duplicate assertions are generated that waste space in the assertion table.

Also, HasSameOp1 only checks op1.vn but that is bogus for OAK_NO_THROW assertions, most of the time is 0.

Commit migrated from https://github.com/dotnet/coreclr/commit/12820c1c9deb3783573f02ba6a94246e7081c290