[PATCH] x86-64: Return SHN_COMMON on non-ELF input

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elf_x86_64_common_definition segfaults on PE/x86-64 input.  Return
SHN_COMMON on non-ELF input.  Linker now gets assertion fail at
bfd/coffgen.c:575, instead of getting segfault.

PR ld/34449
* elf64-x86-64.c (elf_x86_64_common_definition): Return
SHN_COMMON on non-ELF input.


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H.J.

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