buildbot failure in LLVM on sanitizer-x86_64-linux (-Wframe-larger-than)

[Chandler Carruth]

On Thu, Jun 5, 2014 at 4:33 PM, Alexey Samsonov <vonosmas at gmail.com> wrote:

> Hi Alp,
>
> This warning should be fixed by r210301. However, consider investigating
> why the frame size appears to be that large. I believe we build this code
> with GCC as well and have seen no complaints
> from its implementation of -Wframe-larger-than.
>

FYI, GCC does a certain amount of stack sharing at -O0, LLVM doesn't.
Currently, we don't have a good model for preserving debug information in
the presence of these transformations which is why we don't do any of this.
Eventually, we really want  to do more here by using the lexical scope of
the variable as the limit of how long we preserve debug information.
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