Benchmarks results for FreeBSD 11

[Eric A. Borisch]

FWIW, in MacPorts, we patch clang such that it can find the (MacPorts
provided) libomp headers and library. This lets -fopenmp "just work,"
and configure scripts can do their job. The libomp headers and lib in
dedicated sub-directories to minimize the impact of -fopenmp adding
them to the include and link paths.

It is a fairly minor patch, and shouldn't (tm) have any impact on
clang executions without an openmp flag:
https://trac.macports.org/browser/trunk/dports/lang/llvm-3.8/files/openmp-locations.patch

To get a simple OpenMP test script to compile on FreeBSD, I currently
need to pass (note I'm not the one using -lm):

  clang38 -fopenmp -o test test.c -L /usr/local/llvm38/lib  -lm

instead of (~ what configure will try)

  clang38 -fopenmp -o test test.c

(11.0RC2 w/ llvm38 installed via pkg)

I'd love to see base include llvm's OpenMP support, but failing that,
the one from ports should be made to work as configure scripts expect.

And who knows, if it is there, maybe some items in base will start to
use it. We've got a chicken-and-egg problem right now.

 - Eric