r210372 - Add -Wtautological-undefined-compare and -Wundefined-bool-conversion warnings

[Chandler Carruth]

On Thu, Jun 12, 2014 at 8:21 PM, Arthur O'Dwyer <arthur.j.odwyer at gmail.com>
wrote:

> FYI, I've worked on at least two commercial products which contained
> constructs similar to
>
>     void Crash() { *(volatile int*)0 = 42; }
>

This doesn't really bind a reference, and we exempt volatile things from
the null pointer warnings we already have so it seems like this would just
follow suit.
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