Added Rhealstone benchmark to testsuites

The Rhealstone benchmarks six operations that are critical components
of a real-time system. It allows for an objective analysis to be
performed, and allows for comparisons between systems.
See rhealstone/README for more information.

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+== Rhealstone Benchmark For RTEMS
+
+This is an implementation of the Rhealstone benchmarks for RTEMS.
+
+The Rhealstone metric is a set of benchmarks that aim to provide an independently
+verifiable objective measure of real-time performance in different systems. The
+Rhealstone metric is composed of six independent benchmarks, each of which measure
+an activity that is critical in real time systems:
+
+* Task switch time
+* Task preemption time
+* Interrupt latency time
+* Semaphore shuffle time
+* Deadlock breaking time
+* Intertask message latency
+
+An implementation of the Rhealstone metric allows for RTEMS performance to be
+compared with other real-time systems.
+
+The original proposal outlining the Rhealstone benchmark can be found http://collaboration.cmc.ec.gc.ca/science/rpn/biblio/ddj/Website/articles/DDJ/1989/8902/8902a/8902a.htm[here].
+
+Some other implementations can be seen in http://timsengineeringblog.weebly.com/masters-thesis.html[FreeRTOS] and http://collaboration.cmc.ec.gc.ca/science/rpn/biblio/ddj/Website/articles/DDJ/1990/9004/9004d/9004d.htm[iRMX].