* config/darwin.c (machopic_define_symbol): Use gcc_assert or
	gcc_unreachable as appropriate.
	(machopic_function_base_name, machopic_indirect_data_reference,
	machopic_legitimize_pic_address, darwin_non_lazy_pcrel): Likewise.
	* config/host-darwin.c (darwin_gt_pch_use_address): Likewise
	* config/rs6000/altivec.md (*mov<mode>_internal,
	build_vector_mask_for_load): Likewise.
	* config/rs6000/darwin.md (movdf_low_si, movdf_low_di,
	*call_nonlocal_darwin64, *call_value_nonlocal_darwin64,
	*sibcall_symbolic_64, *sibcall_value_symbolic_64): Likewise.
	* config/rs6000/predicates.md (easy_fp_constant,
	logical_operand): Likewise.
	* config/rs6000/rs6000.c (spe_expand_predicate_builtin,
	compute_save_world_info, rs6000_emit_prologue,
	rs6000_output_mi_thunk): Reword comments to avoid 'abort'.
	* config/rs6000/host-darwin.c (segv_handler): Use fancy_abort
	directly.

From-SVN: r99152