Try CHPL_RT_NUM_THREADS_PER_LOCALE=numPus for chap04

I lied, the last time wasn't my last experiment :)

This is to help weed out any real performance regressions vs regressions
because we don't use hyperthreads.
Merge pull request #382 from ronawho/qthreads-testing

Try CHPL_RT_NUM_THREADS_PER_LOCALE=numPus for chap04

I lied, the last time wasn't my last experiment :)

This is to help weed out any real performance regressions vs regressions
because we don't use hyperthreads.