* MIPS: updated registers, dropped special registers not recognized by GAS (actually, "pc" is recognized, but it is used only for MIPS16 mode, so it is easier to add back if/when this mode is supported), added FPU condition code registers ($fcc0..$fcc7).
* cpubase.pas, std_regname: changed logic to lookup known names for special registers before resorting to default name, so that $fcc0..$fcc7 can be used as operands.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27992 3ad0048d-3df7-0310-abae-a5850022a9f2