elf: Always append ".COUNT" to local symbols

Always append ".COUNT" to local symbols to avoid potential conflicts
with existing local symbol "XXX.COUNT".

bfd/

	PR ld/27825
	* elflink.c (elf_link_output_symstrtab): Always append ".COUNT"
	to local symbols.

ld/

	PR ld/27825
	* testsuite/ld-elf/pr27825-1.d: New file.
	* testsuite/ld-elf/pr27825-1a.s: Likewise.
	* testsuite/ld-elf/pr27825-1b.s: Likewise.
	* testsuite/ld-elf/pr27825-2.d: Likewise.
	* testsuite/ld-elf/pr27825-2a.s: Likewise.
	* testsuite/ld-elf/pr27825-2b.s: Likewise.