[lldb] Fix typealias not being emitted for weakly captured generic #7580
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The typealias to $__lldb_context (the self type) was not being emitted when self was weakly captured and the type of self was a generic class type. Fix this, and also make AddRequiredAliases return an error code in case it was unable to emit one of the required aliases.
rdar://104697539
(cherry picked from commit 6fb5c0f)