[patch] Produce .weak_def_can_be_hidden for some linkonce_odr values

[Rafael Espíndola]

On 29 October 2013 00:33, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
>>> How much do we lose
>>> if you don't do this recomparison, is that tolerable? I realize that getting
>>> a second run of globalopt at the end is going to be time consuming to prove
>>> worthwhile, but I really think it's the right way to go.
>>
>> With a notaddrtaken attribute the run of GlobalOpt we have would be
>> sufficient. This check is at the very end of the compilation.  I will
>> benchmark a build without the GlobalStatus::analyzeGlobal and report
>> as soon as the bootstrap finishes.
>>
>
> The result is far more modest:
>
> $ nm build-patch2/bin/clang | grep ' T ' | wc
>
>    20850 62550 1763368

The more restricted patch is attached. We can start with that if you want.

Cheers,
Rafael
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