SH: new, simpler PIC parsing technique

[Alexandre Oliva]

A while ago, I've brought up a discussion regarding a new, perhaps
more efficient way to parse PIC expressions such as symbol@GOT, @PLT,
@GOTOFF and GLOBAL_OFFSET_TABLE.  Here's the implementation I came up
with.  IMO, it greatly simplifies PIC handling in the SH assembler,
it's more reusable, in part because it's not limited to PIC
expressions in .longs or so, but rather usable in expressions in
general.  I've verified that this patch makes no difference in the
binutils and GCC testsuites results.  Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me