Debugger: Streamline ramping down

There were only two used target states, and in case of mixed
debugging all parts of the machinery better agree on the
direction. So one bool in the (shared) runTool is sufficient.

Change-Id: Iffbf1651b82dde707cfc37d8da9d3da573b34b76
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/cdb/cdbengine.cpp

@@ -838,7 +838,7 @@ void CdbEngine::shutdownEngine()
 
 void CdbEngine::abortDebugger()
 {
-    if (targetState() == DebuggerFinished) {
+    if (isDying()) {
         // We already tried. Try harder.
         showMessage("ABORTING DEBUGGER. SECOND TIME.");
         m_process.kill();
@@ -1834,7 +1834,7 @@ unsigned CdbEngine::examineStopReason(const GdbMi &stopReason,
 {
     // Report stop reason (GDBMI)
     unsigned rc  = 0;
-    if (targetState() == DebuggerFinished)
+    if (isDying())
         rc |= StopShutdownInProgress;
     if (debug)
         qDebug("%s", qPrintable(stopReason.toString(true, 4)));