Remove stale trace-ir test files

Remove stale trace-ir test files

These test files test things that are now pre-conditions in the library,
that used to throw exceptions.

We could in theory keep testing these cases (verify that the
precondition failure is correctly caught, when in dev mode), but we
would have to change the test strategy completely.  It's not really a
priority, so for now, just remove them.

Signed-off-by: Simon Marchi <simon.marchi@efficios.com>