4x faster strlen with 4 char sentinel

[Ola Fosheim Grøstad via Digitalmars-d-announce]

On Monday, 27 June 2016 at 21:41:57 UTC, Jay Norwood wrote:
> measurements. I'm using a 100KB char array terminated by four 
> zeros, and doing strlen on substring pointers into it 
> incremented by 1 for 100K times.

But this is a rather atypical use case for zero terminated 
strings? It would make more sense to test it on a massive amount 
of short strings stuffed into a very large hash-table. 
(filenames, keys, user names, email adresses etc)