Merge pull request #10533 from adrian-prantl/runtime-type-visitor

[lldb] Factor out iteration over runtime types from GetChildCompilerT…

Author: adrian-prantl

lldb/source/Plugins/LanguageRuntime/Swift/SwiftLanguageRuntime.h

@@ -67,6 +67,8 @@ struct SuperClassType;
 using ThreadSafeReflectionContext = LockGuarded<ReflectionContextInterface>;
 
 class SwiftLanguageRuntime : public LanguageRuntime {
+  friend class SwiftRuntimeTypeVisitor;
+
 protected:
   SwiftLanguageRuntime(Process &process);