Termination and Self-Verification in ForkJoin Actor Creation and Throughput.

[smarr]

These two benchmarks do currently not do self-verification beside checking the results of the computation, which is there to avoid dead-code elimination.

Furthermore these two benchmarks rely (like many others) on the availability of .awaitTermination() in most incarnations. I saw in the Habanero versions the use of finish() instead.

In my version I went with returning promises with the computation result or the number of messages processed.
However, that changes the benchmark quite a bit, so I wonder whether it is an acceptable solution.

See smarr/SOMns-corelib@e2cc695 and smarr/SOMns-corelib@6d0d97e