Fix .dwsect generation for XCOFF. Handle .function generated with DWARF on XCOFF.

Fix .dwsect generation for XCOFF.  Handle .function generated with DWARF on XCOFF.

gas	* config/tc-ppc.c (ppc_function): Update comment for
	fifth argument.
	(ppc_frob_symbol): Remove ppc_last_function check.
	Make sure coff_last_function is reset.
	Correctly set fsize when not provided in .function.
	* testsuite/gas/ppc/aix.exp: New tests.
	* testsuite/gas/ppc/xcoff-function-1-32.d: New test.
	* testsuite/gas/ppc/xcoff-function-1-64.d: New test.
	* testsuite/gas/ppc/xcoff-function-1.s: New test.

bfd	* coff-rs6000.c (xcoff_dwsect_names): Add new DWARF
	sections.
	* coffgen.c (coff_pointerize_aux): Handle C_DWARF.
	(coff_print_symbol): Likewise.
	* libxcoff.h (XCOFF_DWSECT_NBR_NAMES): Update.

gas	* config/obj-coff.c (coff_frob_symbol): Don't skip C_DWARF.
	(coff_adjust_section_syms): Use corrext auxent for C_DWARF.
	(coff_frob_section): Likewise.
	* config/obj-coff.h (SA_GET_SECT_SCNLEN,
	SA_GET_SECT_NRELOC, SA_SET_SECT_SCNLEN,
	SA_SET_SECT_NRELOC) New defines.
	(SET_SECTION_RELOCS): Adjust for C_DWARF.
	* config/tc-ppc.c (ppc_frob_symbol): Don't skip C_DWARF.
	(ppc_adjust_symtab): Reorder C_DWARF symbols.
	* testsuite/gas/ppc/aix.exp: New tests.
	* testsuite/gas/ppc/xcoff-dwsect-2-32.d: New test.
	* testsuite/gas/ppc/xcoff-dwsect-2-64.d: New test.
	* testsuite/gas/ppc/xcoff-dwsect-2.s: New test.

include	* coff/internal.h (C_DWARF): New define.
	* coff/xcoff.h (SSUBTYP_DWLOC, SSUBTYP_DWFRAME,
	SSUBTYP_DWMAC): New defines.