Bug # 61144 is a regression in 4.9.0 that breaks building of musl libc
due to aggressive and semantically-incorrect constant folding of weak
aliases. The attached patch seems to fix the issue. A weak alias
should never be a candidate for constant folding because it may always
be replaced by a strong definition from another translation unit.

For details see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61144

I do not have a copyright assignment on file but this patch should be
sufficiently trivial not to require it.

Rich