Attempt to fix PR 13856

[Zack Weinberg]

This is an attempt to fix PR 13856 (not handling .hidden correctly
when applied to a definition [in the libc source] of a built-in
function).  It doesn't quite work yet.  I am seeing a small number of
failures - ICEs in dwarf2out.c::add_abstract_origin_attribute and in
builtin.c::expand_builtin.  I am repeating bootstrap overnight to see
if they are unrelated.

zw

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