* elf64-ppc.c (struct ppc_link_hash_entry): Add is_func and

	is_func_descriptor fields.
	(link_hash_newfunc): Init them.
	(ppc64_elf_check_relocs): Only R_PPC24_REL24 syms starting with a
	dot are candidates for plt entries.  When processing .opd relocs,
	set function descriptor strings to point inside function code
	string, and set new ppc_link_hash_entry fields.
	(ppc64_elf_gc_sweep_hook): Don't sweep R_PPC64_REL24 relocs.
	(ppc64_elf_adjust_dynamic_symbol): Remove most code dealing with
	function descriptors.  It's now done in..
	(func_desc_adjust): New.
	(ppc64_elf_func_desc_adjust): New.
	(define elf_backend_always_size_sections): Define.
	(ppc64_elf_hide_symbol): New.
	(define elf_backend_hide_symbol): Define.
	(allocate_dynrelocs): Remove code looking up function descriptors
	as that has been done earlier.
	(ppc64_elf_size_dynamic_sections): Use htab shortcut to elf hash
	table.
	(ppc64_elf_finish_dynamic_symbol): Likewise.  Remove code looking
	up function descriptor.
	(build_one_stub): Look up the function code sym.  Check for
	invalid plt offsets.
	(ppc64_elf_relocate_section): Tweak calls to undefined weak syms.
	Convert R_PPC64_TOC relocs to R_PPC64_RELATIVE in shared libs.

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