x86-64: Return SHN_COMMON on non-ELF input

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.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
1 file changed