implement negdi2 on frv

[Alexandre Oliva]

This relatively obvious patch gives us a non-negligible performance
and space improvement, since using a library call to negate a 64-bit
value is pretty silly.  I've circulated this within Red Hat and got
general agreement that it was pretty obvious, but since we're in
no-new-features mode, I thought I'd ask first.  This got a significant
amount of testing over the past few weeks, but I'd failed to bring it
up here.  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