patch: break into debugger on death in sanitizers

[Chandler Carruth]

On Fri, Oct 25, 2013 at 11:52 AM, Kostya Serebryany <kcc at google.com> wrote:

> I am not opposed to this change, but I'd like to test it a bit more
> carefully to make sure none of our users get angry on us for behavior
> change.
> I'd suggest to put this sigtrap under a flag (off by default) and then
> flip the default to true after a bit of testing.
> We already have abort_on_error, may add sigtrap_on_error or some such.
>

Ugh.

So, I'm kind of sad about this because this is the number one most
frustrating part of debugging UBSan and ASan failures -- they completely
misbehave when running under gdb. =[
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