* elf-bfd.h (struct cie): Use bfd_vmas for code_align, ra_column and

	* elf-bfd.h (struct cie): Use bfd_vmas for code_align, ra_column and
	augmentation_size.  Use bfd_signed_vmas for data_align.
	* elf-eh-frame.c (read_uleb128, read_sleb128): Delete in favor of...
	(read_byte, skip_leb128, read_uleb128, read_sleb128): ...these new
	functions.  Don't read past the end of the enclosing CIE or FDE.
	(skip_bytes): New utility function.
	(_bfd_elf_discard_section_eh_frame): Use new functions, adding more
	sanity checking.
	(_bfd_elf_write_section_eh_frame): Use new functions.