Debugger: Be more verbose in dumper debug output

One of the should-not-happen situations seem to happen.
Add extra output to help to track it down.

Change-Id: I40bad85ce2fbaf1f02043b3d97f657461f5a1995
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Debugger: Go back to normal after attempting to kill GDB

Task-number: QTCREATORBUG-13044
Change-Id: I2610136b1d5c4c2d55d13b378156d382ab6f73cc
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>