[patch] First step to fix pr11866 during LTO

[Rafael Espíndola]

>> Any thoughts on the patch itself?
>>
> The patch looks fine to me. Though it might be worthwhile explaining the difference between the symtab and external name in one of the comments. I'm CC'ing Nick to see if this is something that ld64 should use.

I have attached a new version of the patch with more comments.

Cheers,
Rafael
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