iOS: Debugger: Mixed debugging might crash QC

Note: This issue seems not to be reproducible always.

Steps to reproduce:

• create a Qt Quick Application from template
• select a kit using Qt for iOS (I've used Qt5.4.1)
• set a bp inside the main.cpp and inside the main.qml
• ensure you have mixed debugging enabled
• start debugging
  • bp inside the main.cpp is hit
  • trigger continue after some waiting

Current result:

• QC may crash