[patch] Produce .weak_def_can_be_hidden for some linkonce_odr values

[Rafael Espíndola]

The attached patch produces a weak_def_can_be_hidden for linkonce_odr
if they are also unnamed_addr or don't have their address taken.

There is not a lot of documentation about .weak_def_can_be_hidden, but
from the old discussion about linkonce_odr_auto_hide and the name of
the directive this looks correct: these symbols can be hidden.

Cheers,
Rafael
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