[lldb] Harden register type XML serialization (#218503) This is patch 1/5 preparing LLDB's register-type infrastructure for GDB XML vector types. - Deduplicate emitted type definitions by XML ID instead of object address. - Centralize XML attribute escaping in `RegisterType`. - Escape enum, flags, field-reference, and register type IDs. - Add missing `&` escaping to LLGS XML attributes. XML references identify types by their textual ID, so separate objects with the same ID must not produce duplicate definitions. Co-authored-by: Bar Soloveychik <barsolo@fb.com>
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