Applied fix from #4 in our local fork of the module.

In the end, someone will need to do the work to enable the AOT/trim/single file safety analyzers and [address all the warnings](https://devblogs.microsoft.com/dotnet/creating-aot-compatible-libraries/), but this is enough to have a golden path that makes `sample/StackTrace` project produce the same results under native AOT as under JIT.

Necessary fixes:

* `GetMethodBody` under AOT throws. This will not return anything useful under Mono with ILStrip either. The code simply needs to deal with it.
* Runtime reflection stack doesn't guarantee referential equality of `MemberInfo`s (except for `TypeInfo`). This is also true on JIT-based runtimes, but there's even less caching on native AOT. Use operator `==`.
* The reflection to read `TupleElementNamesAttribute` is trim-unfriendly and cannot be analyzed. Replace with no-reflection.
* Some fallout from the previous point because the nullable annotations on the thing returned by reflection were wrong.