Use a new and empty cleanup list for try statements when entering a function

Use a new and empty cleanup list for try statements when entering a function

The cleanup list is local to a function definition. Otherwise inner functions
would create cleanup code for try statements in outer functions leading
to crashes.

Change-Id: I5d35893b0ea6b0692cda44d5b34b0bb3dfc93fdd
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>