Fix bug in ProcessPOSIX::IsAlive() exposed by r178324

- process in 'unloaded' state was (incorrectly) considered to be alive by POSIX plugin
- above caused a regression in TestProcessLaunch cases

llvm-svn: 178493

lldb/source/Plugins/Process/POSIX/ProcessPOSIX.cpp

@@ -425,7 +425,10 @@ bool
 ProcessPOSIX::IsAlive()
 {
     StateType state = GetPrivateState();
-    return state != eStateDetached && state != eStateExited && state != eStateInvalid;
+    return state != eStateDetached
+        && state != eStateExited
+        && state != eStateInvalid
+        && state != eStateUnloaded;
 }
 
 size_t