[patch][pr19848] Don't create new comdats in CodeGen

[Rafael Espíndola]

On 8 January 2015 at 03:30, David Majnemer <david.majnemer at gmail.com> wrote:
> I really like this change.  However, don't we need to upgrade existing
> bitcode by inserting stuff into newly made comdats?

I guess so.

It was not initially clear to me that it would be worth it. Old
bitcode files would still work, they would just produce .o files that
would not be as optimized by ELF/COFF linkers.

But the feature is common enough that we should probably upgrade. The
attached patch does that.

Cheers,
Rafael
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