[llvm] r193718 - Produce .weak_def_can_be_hidden for some linkonce_odr values

[Rafael Espíndola]

> Of these 19049 left, how many are weak?  And do they really need to be weak or is there more logic we could add to make more of them can-be-hidden?

Not sure how to test this directly, but on a LTO build on linux (which
uses the same logic) there are only 66 linkonce_odr globals left (list
attached).

Cheers,
Rafael
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