bfd/

bfd/
	* bfd/elf32-ppc.c (struct ppc_elf_link_hash_entry): Add new field
	has_sda_refs.
	(ppc_elf_copy_indirect_symbol): Copy has_sda_refs.
	(ppc_elf_check_relocs): Set has_sda_refs.
	(ppc_elf_adjust_dynamic_symbol): Check has_sda_refs before eliminating
	copy relocations.  Use has_sda_refs to place variables in .sbss.
	(ppc_elf_finish_dynamic_symbol): Use has_sda_refs to place variables in
	.sbss.
ld/testsuite/
	* ld-powerpc/sdalib.s, ld-powerpc/sdadyn.s, ld-powerpc/sdadyn.d: New
	files.
	* ld-powerpc/powerpc.exp: Run the new test.