Debugger[New CDB]: Improve 32bit debugging on 64bit systems.

- Ignore WOW64 breakpoints. Restructure code to examine stop reason
  before notifications to be able handle special stop reasons
  in a simpler way.
- Fix autodetection to look into %ProgramFiles% (x64) as well.

src/plugins/debugger/cdb/cdbengine.h

@@ -152,6 +152,8 @@ private slots:
 private:
     enum SpecialStopMode { NoSpecialStop, SpecialStopSynchronizeBreakpoints };
 
+    unsigned examineStopReason(const QByteArray &messageIn, QString *message,
+                               QString *exceptionBoxMessage) const;
     bool commandsPending() const;
     void handleExtensionMessage(char t, int token, const QByteArray &what, const QByteArray &message);
     bool doSetupEngine(QString *errorMessage);