sh assembler mis-assembles @(r0) and @(r0,)

[Alexandre Oliva]

@(r0) must be spelled @r0, and @(r0,) is clearly incorrect, yet the
assembler would silently parse both of them as @(r0,r0).  This patch
fixes this problem, as well as making sure we report an error should
the comma between the register names in @(r0,r1) be missing.  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}
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