Remove dead code only if function name is replaced

[reazulhoque]

This PR makes sure we try to remove dead code only when we replace the Numpy function names with our own. Removing dead code regardless was failing in cases where we have multiple prange as mentioned in this issue. This PR should close #302.

[PokhodenkoSA]

Please, provide test case.

[reazulhoque]

@PokhodenkoSA this bug was noticed originally because this test was falling back. This PR fixes this test from falling back and offloads it through our pipeline. Should we ask the original author of that test to make sure it fails if it is falling back instead of going through our pipeline?

I can always write tests and that would require setting up a partial compiler pipeline to test it, which is tedious. Please share your thoughts.

[PokhodenkoSA]

this test was falling back.

Does it mean that test did not check that code falling back? So test was blind?
No when you fix the code did you fix the test to check that fallback is not happening now?
I think test should be fixed first to catch bad situation and show that the test fails. Then your fix for the feature should show that it makes test passing.

[reazulhoque]

Does it mean that test did not check that code falling back? So test was blind?

Yes.

I have updated the tests to check for falling back.

[reazulhoque]

@PokhodenkoSA @diptorupd Can you please review it?