Test for issue #591
Forgetting the expectedFailure
Fix #591: POP_BLOCK must undo all stack pushes done inside the block.
Merge pull request #593 from pitrou/fix591

Fix #591: POP_BLOCK must undo all stack pushes done inside the block.
Fix #571: handle variable swapping correctly (by not optimizing LOAD_FASTs too eagerly)

Note there is some complication, because other parts of Numba must still be able to infer that a function result comes from the function arguments.
Add a pass to remove unused temporaries.
(XXX not sure how to test for this)
Remove unused code
Remove IR optimization phase (obsolete?)
Merge pull request #594 from pitrou/fix571

Fix #571: handle variable swapping correctly (by not optimizing LOAD_FAS...
Merge branch 'master' into defer_cuda_import