[Bug 228574] GNU ld doesn't emit _end when linking with lld-linked libc.so

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228574

            Bug ID: 228574
           Summary: GNU ld doesn't emit _end when linking with lld-linked
                    libc.so
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: markj at FreeBSD.org

One difference between a GNU ld-linked libc.so and an lld-linked libc.so is
that the former's _end symbol's section index is SHN_ABS, while the latter's is
that of the bss section. For some reason, GNU ld won't emit an _end symbol when
creating an executable linked with an lld-linked libc. This results in libc's
internal definition being used for curbrk, which is wrong and breaks brk() and
sbrk().

As an experiment, I hacked lld to emit _end with a section index of SHN_ABS,
and used it to link libc.so. Using that, GNU ld behaves as desired.

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