[llvm] r212203 - Don't try to construct debug LexicalScopes hierarchy for functions that do not have top level debug information.

[Aditya Nandakumar]

Thanks Duncan
Bug point reduced it from 27MB to about 3.7. I ran it through opt and brought it down to 2.4MB and am unable to reduce further. Hopefully this is not too big.

Running:
bin/llvm-lto -exported-symbols=“_main” bugpoint-reduced-opt.bc should reproduce the issue.

Attached:

> On Jul 3, 2014, at 5:40 PM, Eric Christopher <echristo at gmail.com> wrote:
> 
> On Thu, Jul 3, 2014 at 5:39 PM, Duncan P. N. Exon Smith
> <dexonsmith at apple.com> wrote:
>> 
>>> On 2014-Jul-03, at 15:34, Eric Christopher <echristo at gmail.com> wrote:
>>> 
>>> On Thu, Jul 3, 2014 at 1:37 PM, Duncan P. N. Exon Smith
>>> <dexonsmith at apple.com> wrote:
>>>> Hi David,
>>>> 
>>>> Aditya is working on a reproduction.  Hopefully you'll have it soon.
>>>> 
>>>> In the meantime, this has gummed up our internal buildbots.  Any chance
>>>> you'd revert proactively?
>>>> 
>>> 
>>> I've gone ahead and reverted this for now in r212298,
>> 
>> Thanks Eric!
>> 
>>> but a
>>> reproducible testcase would be preferred since it's not showing up on
>>> the external bots.
>> 
>> I'll make sure you get one.
>> 
>> Aditya finally has something reproducible on trunk that's huge (~25MB
>> bitcode).  He's just running bugpoint now.  Let's hope it shrinks a bit?
>> 
> 
> Totally. And thanks a ton :)
> 
> -eric
> 
>> Our lab.llvm.org LTO builder [1] would reproduce it, but the config
>> change I made yesterday in our ailing public lab didn't seem to take
>> effect -- I must have restarted the wrong buildmaster or something.
>> I'll look into it.
>> 
>> [1]: http://lab.llvm.org:8013/builders/clang-x86_64-darwin11-Rlto

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