[issue28727] Implement comparison (x==y and x!=y) for _sre.SRE_Pattern

[STINNER Victor]

STINNER Victor added the comment:

Ok, I hope that it's the last attempt: patch 5

* Remove hash(b) != hash(a): only keep tests on hash(b)==hash(a) when b==a
* Replace re.ASCII flag with no flag to test two patterns with different flags

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Added file: http://bugs.python.org/file45529/pattern_compare-4.patch

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