Replace 'ap' with 'up' suffix in variable names. (NFC)

The `ap` suffix is a remnant of lldb's former use of auto pointers,
before they got deprecated. Although all their uses were replaced by
unique pointers, some variables still carried the suffix.

In r353795 I removed another auto_ptr remnant, namely redundant calls to
::get for unique_pointers. Jim justly noted that this is a good
opportunity to clean up the variable names as well.

I went over all the changes to ensure my find-and-replace didn't have
any undesired side-effects. I hope I didn't miss any, but if you end up
at this commit doing a git blame on a weirdly named variable, please
know that the change was unintentional.

llvm-svn: 353912

lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h

@@ -83,7 +83,7 @@ protected:
   DynamicRegisterInfo *GetDynamicRegisterInfo();
 
   lldb::ValueObjectSP m_thread_list_valobj_sp;
-  std::unique_ptr<DynamicRegisterInfo> m_register_info_ap;
+  std::unique_ptr<DynamicRegisterInfo> m_register_info_up;
   lldb_private::ScriptInterpreter *m_interpreter;
   lldb_private::StructuredData::ObjectSP m_python_object_sp;
 };