patch: make ubsan report error summaries

[Nick Lewycky]

On 22 October 2013 21:18, Nick Lewycky <nlewycky at google.com> wrote:

> The attached patch makes ubsan emit summaries of errors it encounters. The
> format of these summaries is:
>   UndefinedBehaviourSanitizer: signed-integer-overflow file:49:7
> where the string is the flag name. Most of the patch is adding the flag
> names to all the reports all over.
>

I've noticed a small bug, for load-invalid-value we always pick "enum" and
never "bool". I would guess that's because ASTContext::getTypeSize(BoolTy)
returns 8 instead of 1?

Richard, thoughts?

Nick

This patch is stacked on top of
> http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20131021/091535.html ,
> or else ubsan's tests will fail.
>
> Please review!
>
> Nick
>
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