Fortran toolchain support

[stephenrkell]

Some of the SPEC CPU benchmarks are written in Fortran and it'd be nice to cover them. I don't imagine it's very much work.

I should probably have said gfortran, as the details of how memory is allocated at ABI level is very likely implementation-specific.

[stephenrkell]

Obligatory addition: of course I care about more than benchmarks, so it'd be nice to be able to help Fortran programs/programmers also. :-)