* libnlm.h (struct nlm_obj_tdata): New field backend_data.

	* libnlm.h (struct nlm_obj_tdata): New field backend_data.
	(nlm_backend_data, nlm_alpha_backend_data): New accessor macros.
	(struct nlm_backend_data): New field no_uninitialized_data.
	(nlm_no_uninitialized_data): New accessor macro.
	* nlmcode.h (nlm_compute_section_file_positions): Handle
	no_uninitialized_data.
	(nlm_external_reloc_compare): Sort relocs by address for a
	particular symbol, to make the sort more stable.
	(nlm_write_object_contents): Cast the arguments to qsort.  Get the
	value of a debugging symbol the same way we get the value of a
	normal symbol.
	* nlm32-alpha.c: Various changes.  Write out GP and .lita relocs.
	Set no_uninitialized_data to true.
	* nlm32-i386.c (nlm32_i386_backend), nlm32-sparc.c
	(nlm32_sparc_backend): Set no_uninitialized_data field false.
	* nlmswap.h (nlm_swap_fixed_header_out): Zero out destination
	before filling it in.