Add some filtering to massif C++ tests with GCC on FreeBSD

Add some filtering to massif C++ tests with GCC on FreeBSD

I should perhaps just delete these expected. The testcases don't
work well with the stripped libstc++ without debuginfo on FreeBSD.
That means that the --ignore-fn= options don't work to remove
exception handling and iostream allocations and just leave the
tesatcase allocations.