Use SIMD to accelerate comment lexing

[Jonathan M Davis via Digitalmars-d]

On Tuesday, 2 June 2015 at 15:08:07 UTC, Walter Bright wrote:
> Just make it work with one compiler on one platform, the most 
> convenient one. We can extend it to others later.

Plus, within a few months, we may have switched over to ddmd 
(hopefully), in which case, you can just do it the D way.

- Jonathan M Davis