PyCQA / astroid / 1585

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Avoid a call to `getcwd` if it is not needed

When profiling locally, approximately 7% of a full pylint run is spent in `os.getcwd`, despite its value effectively not being used if `context_file` is `None`.  A quick grep over this project and others seem to indicate that `context_file` is rarely used, so this should almost entirely get rid of this system call.

3 of 3 new or added lines in 1 file covered. (100.0%)

29793 of 33194 relevant lines covered (89.75%)

4.45 hits per line