* 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_unsigned_leb128, read_signed_leb128)
(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.