fix: use after free returning string_view bound to local string

Author: mizvekov

src/lib/Support/LegibleNames.cpp

@@ -192,7 +192,7 @@ class LegibleNames::Impl
         If the symbolhas no name, then a reserved name based
         on the type is returned instead.
      */
-    std::string_view
+    std::string
     getRawUnqualified(SymbolID const& id)
     {
         Info const* I = corpus_.find(id);