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cmd/link: export specialized variants of runtime._type to debug_info #19602
The reflect package can be used to create new types at runtime, these types will have runtime._type entries describing them but no entry in debug_info (obviously).
A debugger that wanted to print the value of variables with such types will have to read the runtime._type directly, however the "specializations" of runtime._type (runtime.slicetype, runtime.maptype, etc) are not exported to debug_info, besides runtime.interfacetype.
All those types (i.e. runtime.slicetype, runtime.maptype, etc) should be exported to debug_info so that debuggers don't have to hard-code their description.