Running /t:GenerateReferenceSource leads to a ton of differences between the generated files and what we currently have for the refs. Some of the differences are by design, e.g. ifdefs, but many are not:

• Out-of-order members
• Missing _dummy or _dummyPrimitive fields (which seems like it could be a bug)
• Missing protected ctors on abstract classes
• Whitespace differences, e.g. blank lines, spaces between generic type parameters, etc.
• Missing namespace qualifiers
• Numeric vs named Flags enum attribute arguments
• etc.

It would be good to clean all of this up, in order to a) do an audit to make sure nothing important is wrong, and b) make it easier in the future to use GenerateReferenceSource for minor additions without then needing to deal with a ton of noise.