0b8a656ba1
The [protocol](https://microsoft.github.io/debug-adapter-protocol//specification.html#Types_Source) expects that `sourceReference` be less than `(2^31)-1`, but we currently represent memory address as source reference, this can be truncated either when sending through json or by the client. Instead, generate new source references based on the memory address. Make the `ResolveSource` function return an optional source.