Language performance benchmark be updated 2019/11/09

[Jacob Shtokolov]

On Saturday, 16 November 2019 at 16:34:58 UTC, Jacob Shtokolov 
wrote:
> Just tried to compile and run Base64

The Havlak test is closer to reality:

```
Nim:    12.24s, 477.8Mb
C++:    17.33s, 179.3Mb
Golang: 21.58s, 358.0Mb
D LDC2: 23.55s, 460.4Mb
D DMD:  29.04s, 461.9Mb
```

Nim is the winner.

But here I would look into the code: what makes LDC produce such 
poorly optimized binary.