Wrong value for sext i1 true in BasicAliasAnalysis

[Nicholas White]

Hi -

Thanks for the repro. For context, I changed zext to sext on line 268 to
fix another bug (see test cases on that commit).

> I also don't understand, for example, why it is correct to truncate and
re-extend the already-computed Offset and Scale from the caller

I agree - I'll have a look tonight and see if I can come up with a proper
fix, as clearly neither zext or sext is always correct!

Nick
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