ld: Change indirect symbol from IR to undefined

bfd/

	PR ld/28264
	* elflink.c (_bfd_elf_merge_symbol): Change indirect symbol from
	IR to undefined.

ld/

	PR ld/28264
	* testsuite/ld-plugin/lto.exp: Run PR ld/28264 test.
	* testsuite/ld-plugin/pr28264-1.d: New file.
	* testsuite/ld-plugin/pr28264-2.d: Likewise.
	* testsuite/ld-plugin/pr28264-3.d: Likewise.
	* testsuite/ld-plugin/pr28264-4.d: Likewise.
	* testsuite/ld-plugin/pr28264.c: Likewise.
	* testsuite/ld-plugin/pr28264.ver: Likewise.
8 files changed