mips gas (n64) generates UNDEF symtable entry for $fcc<N>

[Alexandre Oliva]

Since the n64 bfd doesn't consider `$' a prefix for local symbols,
references to say `$fcc1' are registered in the symbol table by
operand() as global symbols before we get a chance to reinterpret them
as condition code registers, and then they end up making it to the
symbol table of the object file as undefined symbols, causing link
problems later.  This patch corrects this by registering these names
as register names upfront, like we do for so many other register
names.  No regressions on athlon-pc-linux-gnu-x-mips-elf.  Ok to
install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer