[issue21037] add an AddressSanitizer build option

[Charles-François Natali]

Charles-François Natali added the comment:

Note that ASAN will interfere with the faulthandler's module (since it sets up its own signal handlers), so if we were to incorporate it into the test suite, that's something we should look after.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21037>
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