IRGen: Add a list of class_ro_t referenced from generic class metadata patterns to a section __swift_rodatas #60231
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Put pointers to class_ro_t referenced from generic class patterns in a section __swift_rodatas such that they are discoverable by the linker.
The linker can then make the method lists contained in the class_ro_t relative like it can for objective c class metadata from non-generic swift classes.
rdar://66634459