Add cold versions of benchmarks.

Add cold versions of benchmarks.

- Created macros for one and two buffer benchmarks to simplify
  addition of new benchmarks.
- Created cold versions of all benchmarks that work on buffer benchmarks.
  This means that the benchmark is given buffers that are not in the cache.
- Verified the cold versions are working as intended by
  changing it so that the same buffer is written in each loop
  instead of the strided buffer. Using this method, the cold and
  normal benchmark run at the same speed.

Change-Id: Ie5d1b015dd70d3935cfa2830a82955429a2f5b3c