PowerPC64 ELFv2 symbols defined in plt

In a non-pic executable, ELFv2 like other targets, needs to emit a plt
entry even for non-call references to functions defined in shared
libraries, and define the function on the plt code.

	* elf64-ppc.c (ppc64_elf_copy_indirect_symbol): Copy
	pointer_equality_needed flag.
	(ppc64_elf_check_relocs): For ELFv2 arrange to emit plt
	entries for references to functions in shared libraries on
	non-call relocs.
	(readonly_dynrelocs): Split into function of the same name and..
	(maybe_set_textrel): ..this new function.  Update call.
	(ppc64_elf_adjust_dynamic_symbol): Don't emit dynrelocs for
	ELFv2 in most cases if we have a plt entry.  Use new
	readonly_relocs.
	(allocate_dynrelocs): For ELFv2, don't allocate dynreloc space
	for ifunc in static executables.
	(size_global_entry_stubs): New function.
	(ppc64_elf_size_dynamic_sections): Call size_global_entry_stubs.
	Save end of glink branch table.
	(ppc64_elf_hash_symbol): New function.
	(build_global_entry_stubs): New function.
	(ppc64_elf_build_stubs): Call build_global_entry_stubs.  Adjust
	glink sizing.
	(ppc64_elf_relocate_section): Tidy plt16/32/64 reloc code.
	(ppc64_elf_finish_dynamic_symbol): For ELFv2, adjust symbols
	defined on plt code.

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