SIL: Revert public linkage for @_silgen_name
forward declarations
#78244
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It turns out that the stdlib build depends on
internal
functions with@_silgen_name
getting hidden linkage in some configurations. Instead of messing with the linkage computation, just fix thestdlib/Error.swift
test by makingsetWillThrowHandler
public
to give it the right linkage.Reverts #78183.
Resolves rdar://141590619.