Add ImportC compiler to dmd

[Araq]

On Thursday, 13 May 2021 at 00:11:58 UTC, Walter Bright wrote:
> On 5/12/2021 6:08 AM, deadalnix wrote:
>>  From the PR
>>> WalterBright added the Trivial label 3 days ago
>> 
>> Found it funny.
>> 
>> C is not a fast moving target, so this is probably worth doing.
>
> While adding the Trivial label was indeed my little joke, it's 
> not entirely wrong. C is a small and very well understood 
> language, so implementing a compiler for it doesn't require 
> much cleverness. I've also gone around the horn implementing a 
> C compiler before, and learned to take the canal this time.

Sequence points, volatile, shared memory model, undefined 
behavior, obscure aliasing rules... C is small and well 
understood indeed -- when you chose to ignore all these things 
that happen to contradict your narrative.