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Fully unroll loops with static bounds
>>> import gast as ast
>>> from pythran import passmanager, backend
>>> node = ast.parse('for j in [1,2,3]: i += j')
>>> pm = passmanager.PassManager("test")
>>> _, node = pm.apply(LoopFullUnrolling, node)
>>> print(pm.dump(backend.Python, node))
j = 1
i += j
j = 2
i += j
j = 3
i += j
>>> node = ast.parse('for j in (a,b): i += j')
>>> pm = passmanager.PassManager("test")
>>> _, node = pm.apply(LoopFullUnrolling, node)
>>> print(pm.dump(backend.Python, node))
j = a
i += j
j = b
i += j
>>> node = ast.parse('for j in {1}: i += j')
>>> pm = passmanager.PassManager("test")
>>> _, node = pm.apply(LoopFullUnrolling, node)
>>> print(pm.dump(backend.Python, node))
j = 1
i += j
>>> node = ast.parse('for j in builtins.enumerate("1"): j')
>>> pm = passmanager.PassManager("test")
>>> _, node = pm.apply(LoopFullUnrolling, node)
>>> print(pm.dump(backend.Python, node))
j = (0, '1')
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