[mlpack-git] [mlpack/mlpack] Check if SortStruct provides any benefit. (#712)

[lozhnikov]

I realized that we do not sort huge amounts of data. I corrected the test.
With `-O3` `std::pair` is a little bit faster.
If `n = 10`, `numIterations = 100M`:
```
SortStruct results:
unnecessaryCodeRemovalPreventer = 1.09091e+08
sort duration = 33621ms
std::pair results:
unnecessaryCodeRemovalPreventer = 1.03127e+08
sort duration = 29536ms
```
[main2.cpp.zip](https://github.com/mlpack/mlpack/files/340950/main2.cpp.zip)

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