Add a script for sampling the time it takes for the GPU to timeout (as
indicated by the phone crashing) on an
OpenCL program that executes an infinite loop.

Test various example programs containing infinite loops to see if they
cause a crash:
- for (; ;) {}
- flip output[0] between '1' and '2', and alternate between reading
  input[0] and input[1]
- flip entire output buffer between '1' and '2', and read the entire
  input array