m68k PLT fixes and cleanups

[Nick Clifton]

Hi Richard,

> Ping!

Oops - sorry for missing this one.

>> bfd/
>> 	* elf32-m68k.c (elf_m68k_plt_info): New structure.
>> 	(elf_m68k_plt0_entry): Add R_68K_PC32-style in-place addends.
>> 	(elf_m68k_plt_entry): Likewise.
>> 	(elf_m68k_plt_info): New table.
>> 	(CFV4E_PLT_ENTRY_SIZE): Rename to...
>> 	(ISAB_PLT_ENTRY_SIZE): ...this.
>> 	(CFV4E_FLAG): Delete.
>> 	(elf_cfv4e_plt0_entry): Rename to...
>> 	(elf_isab_plt0_entry): ...this.  Adjust comments.  Use (-6,%pc,%d0)
>> 	for the second instruction too.
>> 	(elf_cfv4e_plt_entry): Rename to...
>> 	(elf_isab_plt_entry): ...this.  Adjust comments and use (-6,%pc,%d0).
>> 	(elf_isab_plt_info): New table.
>> 	(CPU32_FLAG): Delete.
>> 	(PLT_CPU32_ENTRY_SIZE): Rename to...
>> 	(CPU32_PLT_ENTRY_SIZE): ...this.
>> 	(elf_cpu32_plt0_entry): Update bounds accordingly.  Add R_68K_PC32-
>> 	style in-place addends.
>> 	(elf_cpu32_plt_entry): Likewise.
>> 	(elf_cpu32_plt_info): New table.
>> 	(elf_m68k_link_hash_table): Add a plt_info field.
>> 	(elf_m68k_link_hash_table_create): Initialize it.
>> 	(elf_m68k_get_plt_info): New function.
>> 	(elf_m68k_always_size_sections): Likewise.
>> 	(elf_m68k_adjust_dynamic_symbol): Use the plt_info hash table field.
>> 	(elf_m68k_install_pc32): New function.
>> 	(elf_m68k_finish_dynamic_symbol): Factor code using plt_info and
>> 	elf_m68k_install_pc32.
>> 	(elf_m68k_finish_dynamic_sections): Likewise.
>> 	(elf_m68k_plt_sym_val): Use elf_m68k_get_plt_info.
>> 	(elf_backend_always_size_sections): Define.
>>
>> ld/testsuite/
>> 	* ld-m68k/plt1.s, ld-m68k/plt1-empty.s, ld-m68k/plt1.ld: New files.
>> 	* ld-m68k/plt1-68020.d, ld-m68k/plt1-cpu32.d: Likewise.
>> 	* ld-m68k/plt1-isab.d: Likewise.
>> 	* ld-m68k/m68k.exp: Run new PLT tests.
>>

Approved - please apply.

Cheers
   Nick