Optimize reversed(range(...)), with non-constant values.

Also extend glob to support bash {a,b,c} notation (needed for Cythonize script).

Fix condition in declare_cpp_class

The profiler filters lines on the function's __code__ attribute, which
must agree with that created in the profile frame.  Unfortunately, this
makes it difficult to profile anything but 'def' functions.

Condition is no longer valid since commit fa3db367

always create a new IntNode for the step value in iter-range optimisation as we overwrite its value later

Optimized reversed range with constant negative steps.