Radix sort benchmark improvements (#172)
Radix sort benchmark improvements (#172)

* Added a new randomization type that is somewhat similar to kOrdered, but doesn't perform in a pathological way for radix_sort.

* Removed a bunch of special case code for radix sort benchmarks by implementing a custom key extractor.

* Added ability to benchmark radix_sort for the "slow assignment" tests.

Note: this change also modified the element being compared from a int32_t to a uint32_t so that the test could be easily performed using radix sort.

electronicarts/EASTL,electronicarts/EASTL,electronicarts/EASTL