Inline PLT call optimization

Inline PLT call optimization

This patch adds the analysis part of PLT call optimization, enabling
the code added with the previous patch that actually performs the
optimization.

Gold support is not available yet.

bfd/
	* elf64-ppc.c (struct _ppc64_elf_section_data): Add has_pltcall field.
	(struct ppc_link_hash_table): Add can_convert_all_inline_plt.
	(ppc64_elf_check_relocs): Set has_pltcall.
	(ppc64_elf_adjust_dynamic_symbol): Discard some PLT entries.
	(ppc64_elf_inline_plt): New function.
	(ppc64_elf_size_dynamic_sections): Discard some PLT entries for locals.
	* elf64-ppc.h (ppc64_elf_inline_plt): Declare.
	* elf32-ppc.c (has_pltcall): Define.
	(struct ppc_elf_link_hash_table): Add can_convert_all_inline_plt.
	(ppc_elf_check_relocs): Set has_pltcall.
	(ppc_elf_inline_plt): New function.
	(ppc_elf_adjust_dynamic_symbol): Discard some PLT entries.
	(ppc_elf_size_dynamic_sections): Likewise.
	* elf32-ppc.h (ppc_elf_inline_plt): Declare.
ld/
	* emultempl/ppc64elf.em (no_inline_plt): New var.
	(ppc_before_allocation): Call ppc64_elf_inline_plt.
	(enum ppc64_opt): Add OPTION_NO_INLINE_OPT.
	(PARSE_AND_LIST_LONGOPTS, PARSE_AND_LIST_OPTIONS,
	PARSE_AND_LIST_ARGS_CASES): Handle --no-inline-optimize.
	* emultemps/ppc32elf.em (no_inline_opt): New var.
	(prelim_size_sections): New function, extracted from..
	(ppc_before_allocation): ..here.  Call ppc_elf_inline_plt.
	(enum ppc32_opt): Add OPTION_NO_INLINE_OPT.
	(PARSE_AND_LIST_LONGOPTS, PARSE_AND_LIST_OPTIONS,
	PARSE_AND_LIST_ARGS_CASES): Handle --no-inline-optimize.