Code for serialization using sgen makes use of single file dangerous patterns

[tlakollo]

Description

File Compilation.cs makes use of single file dangerous pattern inside function LoadGeneratedAssembly. Depending on the SerializationMode set we could end up throwing an exception or returning null. If returning null, the code will most likely fall back to reflection and just be slower. Since this code is most likely fixable, the warning will be suppressed in code with a reference to this issue until this gets fixed.

cc: @agocke

[StephenMolloy]

@HongGit, @mconnew suggests looking into using a module initializer in the code generated by sgen to add the type/serializer to the existing cache in runtime seriazliation.