Use a 32-bit value to hold the section number in the internal COFF symbol structure.

Use a 32-bit value to hold the section number in the internal COFF symbol structure.

	PR ld/19440
inc	* coff/internal.h (internal_syment): Use int to hold section
	number.
	(N_UNDEF): Cast to int not short.
	(N_ABS): Likewise.
	(N_DEBUG): Likewise.
	(N_TV): Likewise.
	(P_TV): Likewise.

bfd	PR ld/19440
	* coff-rs6000.c (_bfd_xcoff_swap_sym_in): Sign extend external
	section number into internal section number.
	* coff64-rs6000.c (_bfd_xcoff64_swap_sym_in): Likewise.
	* coffswap.h (coff_swap_sym_in): Likewise.
	* peXXigen.c (_bfd_XXi_swap_sym_in): Likewise.
	* coffcode.h (_coff_bigobj_swap_sym_in): Make sure that internal
	section number field is big enough to hold the external value.