[ubsan] nonnull and returns_nonnull sanitization

[Chandler Carruth]

On Tue, Jul 1, 2014 at 6:33 PM, Richard Trieu <rtrieu at google.com> wrote:

> -Wnonnull already warns when it is known at compiler time that a null is
> used in these places.  Nick will know if Clang marks parameters and return
> values as non-null for optimization purposes.


The key would be to annotate them with non-null UBSan checks even if we
aren't sufficiently confident to do so for the optimizer.
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