[issue28082] re: convert re flags to (much friendlier) IntFlag constants

[STINNER Victor]

STINNER Victor added the comment:

The change 5fd69d4a93e0 (use IntFlag for re constants) made the "regex_compile" benchmark slower:

Median +- std dev: [71c1970f27b6] 388 ms +- 3 ms -> [3cf248d10bed] 470 ms +- 4 ms: 1.21x slower

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<http://bugs.python.org/issue28082>
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