* rs6000-tdep.c: Changes throughout for multi-arch 64-bit

	* rs6000-tdep.c: Changes throughout for multi-arch 64-bit
	support.  Incorporate most of tm-rs6000.h.
	(find_toc_address_hook): Rename to rs6000_find_toc_address_hook.
	(rs6000_set_host_arch_hook): Declare.
	(read_memory_addr): Define.
	(pop_frame): Rename to rs6000_pop_frame.
	(rs6000_pop_frame, rs6000_fix_call_dummy, rs6000_push_arguments,
	rs6000_frame_saved_pc, rs6000_frame_chain): Remove non-generic
	dummy frame handling.
	(branch_dest, rs6000_pop_frame, rs6000_skip_trampoline_code,
	rs6000_frame_saved_pc, frame_get_saved_regs,
	frame_initial_stack_address, rs6000_frame_chain,
	rs6000_convert_from_func_ptr_addr): Call read_memory_addr instead
	of read_memory_integer.
	(branch_dest, rs6000_pop_frame, rs6000_push_arguments,
	rs6000_skip_trampoline_code, rs6000_frame_saved_pc,
	frame_get_saved_regs, frame_initial_stack_address,
	rs6000_frame_chain): Replace 4 with TDEP->wordsize.
	(skip_prologue): Recognize some 64-bit stack adjustments.
	(push_dummy_frame, pop_dummy_frame, set_processor,
	show_processor): Delete.
	(frame_get_saved_regs): Manipulate saved register addresses using
	CORE_ADDR instead of int.
	(rs6000_create_inferior): New function.
	(register_names_*[]): Change to struct reg registers_*[].
	(variants[]): Assimilate into multi-arch approach.
	(register_names_*[], variants[]): Refer to pre-PowerPC
	architectures as POWER instead of RS6000.
	* rs6000-nat.c: Ubiquitous changes for 64-bit support.
	(vmap_secs, xcoff_relocate_symtab): Cast addresses
	to unsigned long to avoid sign-extension errors.
	(set_host_arch): New function.
	(xcoff_relocate_symtab): Try disabling usleep(36000) workaround.
	(rs6000_core_fns): Use new bfd_target_xcoff_flavour.
	(_initialize_core_rs6000): Initialize rs6000_set_host_arch_hook.
	* symfile.c (find_sym_fns): Remove special xcoff kludge.
	* xcoffread.c (secnum_to_bfd_section): Initialize args.objfile.
	(process_linenos): Query line struct size from coff
	backend instead of using compile-time constant.
	(enter_line_range): Likewise.
	(read_xcoff_symtab): Pass "XCOFF64" instead of "XCOFF" to
	record_debugformat() if appropriate.
	(process_xcoff_symbol): Access symbol addresses using
	SYMBOL_VALUE_ADDRESS instead of SYMBOL_VALUE.
	(read_symbol_lineno): Retrieve XCOFF64 symbol names from strtbl.
	(scan_xcoff_symtab): Likewise.  Query syment struct size from
	coff backend instead of using compile-time constant.
	(xcoff_sym_fns): Set flavour to bfd_target_xcoff_flavour.
	* Makefile.in (INTERNAL_LDFLAGS): Add $(MH_LDFLAGS) to list of flags
	that this Makefile variable get set to.  (From Kevin Buettner.)
	* config/powerpc/aix.mh (MH_LDFLAGS): Add linker flags so that
	the TOC doesn't overflow.  (From Kevin Buettner.)
	* config/powerpc/tm-ppc-aix.h: Move config decisions to
	multi-arched rs6000-tdep.c.
	* config/rs6000/tm-rs6000.h: Likewise.
	(GDB_MULTI_ARCH): Define.
	(skip_trampoline_code): Rename to rs6000_skip_trampoline_code.
	(is_magic_function_pointer): Replace with
	rs6000_convert_from_func_ptr_addr.
	(TARGET_CREATE_INFERIOR_HOOK): Define.
	(find_toc_address_hook): Rename to rs6000_find_toc_address_hook.
	(rs6000_set_host_arch_hook): Declare.
	* config/rs6000/nm-rs6000.h (CHILD_XFER_MEMORY): Define.