Add read bandwidth and small refactor.

- Addition of read bandwidth test.
- Move the allocation of all buffers used for testing into the
  setSize() function.
- Add a canRun function to indicate whether a test is able to
  run on this platform. Currently, this only disables neon bandwidth
  tests on platforms that don't support neon.
- Refactor the thread testing functions to use one common routine.

Merge from internal master.

(cherry-picked from 1a3794a84074d7f22b8ddaba840aedd758a14cdd)

Change-Id: Ie0f29ec7e484a376471d121333b1982be8f41393
3 files changed