Revert "[lldb][Windows] Remember server's primary stop thread on gdb-remote stops" (#205220)

Reverts llvm/llvm-project#203525 because it breaks TestRealDefinition.py

Author: JDevlieghere

lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp

@@ -2636,8 +2636,6 @@ StateType ProcessGDBRemote::SetThreadStopInfo(StringExtractor &stop_packet) {
 
     SetAddressableBitMasks(addressable_bits);
 
-    m_last_stop_primary_tid = tid;
-
     ThreadSP thread_sp = SetThreadStopInfo(
         tid, expedited_register_map, signo, thread_name, reason, description,
         exc_type, exc_data, thread_dispatch_qaddr, queue_vars_valid,
@@ -2686,14 +2684,7 @@ void ProcessGDBRemote::RefreshStateAfterStop() {
   if (m_initial_tid != LLDB_INVALID_THREAD_ID) {
     m_thread_list.SetSelectedThreadByID(m_initial_tid);
     m_initial_tid = LLDB_INVALID_THREAD_ID;
-  } else if (m_last_stop_primary_tid != LLDB_INVALID_THREAD_ID &&
-             StateIsRunningState(m_last_broadcast_state)) {
-    if (ThreadSP primary_thread_sp =
-            m_thread_list.FindThreadByProtocolID(m_last_stop_primary_tid,
-                                                 /*can_update=*/false))
-      m_thread_list.SetSelectedThreadByID(primary_thread_sp->GetID());
-  }
-  m_last_stop_primary_tid = LLDB_INVALID_THREAD_ID;
+  }
 
   // Let all threads recover from stopping and do any clean up based on the
   // previous thread state (if any).

lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.h

@@ -322,9 +322,6 @@ class ProcessGDBRemote : public Process,
   lldb::CommandObjectSP m_command_sp;
   int64_t m_breakpoint_pc_offset;
   lldb::tid_t m_initial_tid; // The initial thread ID, given by stub on attach
-  lldb::tid_t m_last_stop_primary_tid =
-      LLDB_INVALID_THREAD_ID; // Thread ID extracted from the most recent
-                              // T-packet's "thread:<tid>" key.
   bool m_use_g_packet_for_reading;
 
   bool m_allow_flash_writes;