[lldb] [Process/NetBSD] Report stopped process on SIGSTOP

[mgorny]

Summary

Mark the process as stopped when SIGSTOP arrives. This is necessary
for lldb-server to generate correct response to 'process interrupt',
and therefore to prevent the whole stack crashing when process
is stopped.

Thanks to Pavel Labath for the tip.

[mgorny]

Un-XFAIL some tests fixed by this.

[mgorny]

Two more apparent XPASS-es.

[labath]

cool

lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp

if (siginfo_err.Success()) {
     if (info.psi_siginfo.si_code == SI_USER &&
         info.psi_siginfo.si_pid == ::getpid()) {
       /* Stop Tracking all Threads attached to Process */
       for (const auto &thread : m_threads) {
         static_cast<NativeThreadNetBSD &>(*thread).SetStoppedBySignal(
             SIGSTOP, &info.psi_siginfo);
       }
     }
+    SetState(StateType::eStateStopped, true);
   }
 }
 
 void NativeProcessNetBSD::MonitorSIGTRAP(lldb::pid_t pid) {
   Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
   ptrace_siginfo_t info;
 
   const auto siginfo_err =