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.

Merge from internal master.

(cherry-picked from 991bcd464d67c3cff76477140331619ff138aafc)

Change-Id: I4b1b55510d90cc9a941fd68244971cb08cfba553
Merge "Add cold versions of benchmarks."
am 5b1efce4: Merge "Add cold versions of benchmarks."

* commit '5b1efce4aeea83c7b18dfed5d3366d6b84874c23':
  Add cold versions of benchmarks.
Merge commit 'android-4.4.1_r1' into merge_branch

* commit 'android-4.4.1_r1':
  Add cold versions of benchmarks.
Merge "Merge commit 'android-4.4.1_r1' into merge_branch"
Drop su as we build it with koush/Superuser