This patch fixes debugging of single threaded apps on Linux. 
It also adds some asserts and additional logging support.

from dawn@burble.org


git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@142384 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Plugins/Process/Linux/ProcessLinux.h b/source/Plugins/Process/Linux/ProcessLinux.h
index 713e8ba..1a98443 100644
--- a/source/Plugins/Process/Linux/ProcessLinux.h
+++ b/source/Plugins/Process/Linux/ProcessLinux.h
@@ -177,7 +177,8 @@
     /// Registers the given message with this process.
     void SendMessage(const ProcessMessage &message);
 
-    ProcessMonitor &GetMonitor() { return *m_monitor; }
+    ProcessMonitor &
+    GetMonitor() { assert(m_monitor); return *m_monitor; }
 
     lldb_private::UnixSignals &
     GetUnixSignals();