Fix line number resolution with the interpreter and try {} catch {}

Fix line number resolution with the interpreter and try {} catch {}

When re-entering the interpreter for a try block, we use a different code
pointer and therefore need to set context->interpreterInstructionPointer
accordingly. We do that now at the beginning of run(), before we start
interpreting the instructions. When returning from a try block, we continue
using the old "code" pointer and therefore need to set
context->interpreterInstructionPointer back.

Change-Id: I607aef104d5f74bb0c44c6635619c99a6b397bce
Reviewed-by: Lars Knoll <lars.knoll@digia.com>