eliminate one form of PythonObject::Reset()

Summary:
I'd like to eliminate all forms of Reset() and all public constructors
on these objects, so the only way to make them is with Take<> and Retain<>
and the only way to copy or move them is with actual c++ copy, move, or
assignment.

This is a simple place to start.

Reviewers: JDevlieghere, clayborg, labath, jingham

Reviewed By: labath

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D69080

llvm-svn: 375182

lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp

@@ -410,7 +410,7 @@ void PythonString::SetString(llvm::StringRef string) {
     llvm::consumeError(s.takeError());
     Reset();
   } else {
-    PythonObject::Reset(std::move(s.get()));
+    *this = std::move(s.get());
   }
 }