[lldb][nfc] Split the constructor of ThreadPlanStepOut (#136160)

A subsequent commit will create a new constructor for ThreadPlanStepOut,
which needs to reuse much of the same logic of the existing constructor.
This commit places all of that reusable logic into a separate function.

lldb/include/lldb/Target/ThreadPlanStepOut.h

@@ -82,6 +82,10 @@ private:
       LazyBool step_out_avoids_code_without_debug_info);
 
   void SetupAvoidNoDebug(LazyBool step_out_avoids_code_without_debug_info);
+
+  void SetupReturnAddress(lldb::StackFrameSP return_frame_sp,
+                          lldb::StackFrameSP immediate_return_from_sp,
+                          uint32_t frame_idx, bool continue_to_next_branch);
   // Need an appropriate marker for the current stack so we can tell step out
   // from step in.
 

lldb/source/Target/ThreadPlanStepOut.cpp

@@ -79,6 +79,13 @@ ThreadPlanStepOut::ThreadPlanStepOut(
       ComputeTargetFrame(thread, frame_idx, m_stepped_past_frames);
   StackFrameSP immediate_return_from_sp(thread.GetStackFrameAtIndex(frame_idx));
 
+  SetupReturnAddress(return_frame_sp, immediate_return_from_sp, frame_idx,
+                     continue_to_next_branch);
+}
+
+void ThreadPlanStepOut::SetupReturnAddress(
+    StackFrameSP return_frame_sp, StackFrameSP immediate_return_from_sp,
+    uint32_t frame_idx, bool continue_to_next_branch) {
   if (!return_frame_sp || !immediate_return_from_sp)
     return; // we can't do anything here.  ValidatePlan() will return false.
 
@@ -94,8 +101,8 @@ ThreadPlanStepOut::ThreadPlanStepOut(
       // First queue a plan that gets us to this inlined frame, and when we get
       // there we'll queue a second plan that walks us out of this frame.
       m_step_out_to_inline_plan_sp = std::make_shared<ThreadPlanStepOut>(
-          thread, nullptr, false, stop_others, eVoteNoOpinion, eVoteNoOpinion,
-          frame_idx - 1, eLazyBoolNo, continue_to_next_branch);
+          GetThread(), nullptr, false, m_stop_others, eVoteNoOpinion,
+          eVoteNoOpinion, frame_idx - 1, eLazyBoolNo, continue_to_next_branch);
       static_cast<ThreadPlanStepOut *>(m_step_out_to_inline_plan_sp.get())
           ->SetShouldStopHereCallbacks(nullptr, nullptr);
       m_step_out_to_inline_plan_sp->SetPrivate(true);