[Bug ld/21571] --gc-sections doesn't work with PROVIDE in linker script

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21571

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
ELF linker stores the first input section whose name matches __start_SECNAME
or __stop_SECNAME in     u.undef.section for garbage collection.  If these
symbols are provide in linker script, u.undef.section is set to the section
where they will defined by linker script, which leads to the incorrect output.

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