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(parent: 400e2c9) | patch

Teach simplify_boolean_equality to simplify the forms foo <> true and

Teach simplify_boolean_equality to simplify the forms foo <> true and
foo <> false, along with its previous duties of simplifying foo = true
and foo = false. (All of these are equivalent to just foo or NOT foo
as the case may be.) It's not clear how often this is really useful;
but it costs almost nothing to do, and it seems some people think we
should be smart about such cases. Per recent bug report.

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