[binutils-gdb] Override the previous definition from IR object

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT fbcc8bafeb413a111cd3caab39b3ab57d5b8ce93 ***

Author: H.J. Lu <hjl.tools@gmail.com>
Branch: master
Commit: fbcc8bafeb413a111cd3caab39b3ab57d5b8ce93

Override the previous definition from IR object

Mark the previous definition from IR object as undefined so that the
generic linker will override it.

bfd/

	PR ld/23958
	* elflink.c (_bfd_elf_add_default_symbol): Override the previous
	definition from IR object.

ld/

	PR ld/23958
	* testsuite/ld-plugin/lto.exp: Run PR ld/23958 test.
	* testsuite/ld-plugin/pr23958.c: New file.
	* testsuite/ld-plugin/pr23958.t: Likewise.