Added run script, fix for gpu for heartwall benchmark

Introduced a reduction on the number of kernel threads in order to be
handled by the odroid GPU

opencl/heartwall/main.h

@@ -11,7 +11,7 @@
 #elif defined(RD_WG_SIZE)
         #define NUMBER_THREADS RD_WG_SIZE
 #else
-        #define NUMBER_THREADS 256
+        #define NUMBER_THREADS 128
 #endif
 
 #define CHECK 37

opencl/heartwall/run-gpu

@@ -0,0 +1 @@
+./heartwall 50