RIOT-OS/RIOT — pull request #975 by Kijewski (2014-04-05 01:16:25+00:00)
Title: Fix issue #974

Cachegrind for `test_ipc_pingpong` with `-Os` added for native:
```
Ir I1mr ILmr Dr D1mr DLmr Dw D1mw DLmw file:function
--------------------------------------------------------------------------------
Before:
433,465 0 0 18,015 0 0 6,005 0 0 …/bitarithm.c:number_of_lowest_bit
After:
114,097 0 0 24,020 1 0 6,005 0 0 …/bitarithm.c:number_of_lowest_bit
```