PATCH gas octets vs bytes support

[Timothy Wall]

This patch implements octets vs bytes functionality for GAS

* gas/as.h: Define OCTETS_PER_BYTE and OCTETS_PER_BYTE_POWER default
values.
* gas/frags.c (frag_new): Calculate fr_fix in octets
   (frag_now_fix) Return offset as target address offset (bytes).
   (frag_now_fix_octets) New - Return offset in octets (8-bit
quantities).
* gas/frags.h: Added prototype for frag_now_fix_octets().  Distinguish
between octets and bytes in field descriptions.
* gas/listing.c (calc_hex): Account for octets vs bytes when printing
addresses/offsets.
   (print_lines) Ditto.  Also, if LISTING_WORD_SIZE is not 1, and target
is little-endian, print the octets in a word in big-endian order so that
the display looks like a proper hexadecimal number, instead of having
the octets reversed.
* gas/read.c (do_align): When recording alignment, alignment power
should be in terms of target bytes (minimum addressible unit) instead of
octets.
   (do_org) Convert ORG target address (byte) argument into an octet
offset when generating a variable fragment.
* gas/symbols.c (resolve_symbol_value): Symbol final value converted to
a target address offset (bytes) from its octet offset.
* gas/config/obj-coff.c (coff_frob_symbol): Symbol target address offset
(bytes) is adjusted by the frag offset (octets) converted to bytes.
   (coff_frob_section) Section alignment power is in terms of bytes;
convert it to an octet alignment power when calculating size (and size
mask) in octets.  Don't modify the section size in order to "align" it
for TI COFF, since that format has a different method for storing
alignment information.