[issue21037] add an AddressSanitizer build option

[Stefan Krah]

Stefan Krah added the comment:

Antoine, if you send me the buildbot credentials, we can get started.

Environment vars:

   CC=clang
   ASAN_OPTIONS="allocator_may_return_null=1,handle_segv=0"

I suggest to compile the release build, just --with-address-sanitizer.

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<http://bugs.python.org/issue21037>
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