recent testsuite additions

[Matthew Fortune]

I'm working through the test failures that I introduced with the FPXX
ABI patch and am slightly confused about which MIPS targets are supposed
to use 'traditional' ELF or not. A number of failures are due to the fact
that I only fixed up the traditional ELF expected output files but a target
like mipsisa32-elf is not marked as using traditional ELF in mips.exp.

I thought the difference between traditional and non-traditional was between
linux and irix but I'm not sure I have understood the distinction correctly.

I'll work through updating the non-traditional expected outputs for several
tests in the meantime.

Thanks,
Matthew