frv sibcalls and conditional returns

[Alexandre Oliva]

This patch arranges for GCC to emit optimal code for syscall wrappers
in frv-uclinux.  Sibcalls were already implemented, but Richard
Sandiford says he ran into problems in them a very long time ago,
which got him to fully disable them in the branch we've been working
on, to the point that I reimplemented it from scratch.

Tested on i686-pc-linux-gnu-x-frv-elf, default and -mfdpic multilibs.
Ok to install?

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}