Crash below DebuggerController::DetachAndWait #1083

Sentry Issue: BINARYNINJA-7K

SIGSEGV / SEGV_MAPERR / 0x10: Fatal Error: SIGSEGV / SEGV_MAPERR / 0x10
  File "pthread_mutex_lock.c", line 80, in ___pthread_mutex_lock
  File "gthr-default.h", line 749, in __gthread_mutex_lock
  File "gthr-default.h", line 811, in __gthread_recursive_mutex_lock
  File "mutex", line 108, in std::recursive_mutex::lock
  File "unique_lock.h", line 139, in std::unique_lock<T>::lock
...
(25 additional frame(s) were not displayed)

@bdash says:

DebuggerController::Detach spawns a background thread to run DetachAndWait. Nothing ensures that the ref counted DebuggerController remains alive for the duration of that call.

debugger/core/debuggercontroller.cpp

Lines 1515 to 1521 in e2b7467

	void DebuggerController::Detach()
	{
	if (!m_state->IsConnected())
	return;
	std::thread([&]() { DetachAndWait(); }).detach();
	}