[REG 3.3 -> 3.4] Creator switches to Assembler view when hitting breakpoint

1. Start creating a new Qt Widgets Application project.
2. Configure the project to use MinGW-based Qt.
3. Set a breakpoint in main().
4. Run this in the debugger.
   When the breakpoint is being hit, Creator switches to assembler view.

Instead, it should show the line of C++ code where the breakpoint was hit.

Found by Squish test tst_simple_debug.