[issue17016] _sre: avoid relying on pointer overflow

[Matthew Barnett]

Matthew Barnett added the comment:

Lines 1000 and 1084 will be a problem only if you're near the top of the address space. This is because:

1. ctx->pattern[1] will always be <= ctx->pattern[2].

2. A value of 65535 in ctx->pattern[2] means unlimited, even though SRE_CODE is now UCS4.

See also issue #13169.

If the 'unlimited' value is raised then fixing those lines will become more urgent.

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<http://bugs.python.org/issue17016>
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