[lldb/Plugins] Refactor ScriptedThread register context creation

This patch changes the ScriptedThread class to create the register
context when Process::RefreshStateAfterStop is called rather than
doing it in the thread constructor.

This is required to update the thread state for execution control.

Differential Revision: https://reviews.llvm.org/D112167

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp

@@ -20,7 +20,6 @@
 #include "lldb/Interpreter/ScriptInterpreter.h"
 #include "lldb/Target/MemoryRegionInfo.h"
 #include "lldb/Target/RegisterContext.h"
-
 #include "lldb/Utility/State.h"
 
 #include <mutex>
@@ -291,6 +290,7 @@ bool ScriptedProcess::DoUpdateThreadList(ThreadList &old_thread_list,
   // actually new threads will get added to new_thread_list.
 
   CheckInterpreterAndScriptObject();
+  m_thread_plans.ClearThreadCache();
 
   Status error;
   ScriptLanguage language = m_interpreter->GetLanguage();
@@ -316,6 +316,12 @@ bool ScriptedProcess::DoUpdateThreadList(ThreadList &old_thread_list,
   return new_thread_list.GetSize(false) > 0;
 }
 
+void ScriptedProcess::RefreshStateAfterStop() {
+  // Let all threads recover from stopping and do any clean up based on the
+  // previous thread state (if any).
+  m_thread_list.RefreshStateAfterStop();
+}
+
 bool ScriptedProcess::GetProcessInfo(ProcessInstanceInfo &info) {
   info.Clear();
   info.SetProcessID(GetID());