Integrated code formatter

[Steven Schveighoffer]

On 1/17/22 8:23 PM, H. S. Teoh wrote:

> I'll take a look at the code now to see if there's anything easily
> salvageable...  but at this point I'm ready to propose pulling the
> trigger on -profile=gc completely.  (Based on how I suspect it works,
> I'm expecting that it would not be easy to implement any useful output
> for allocations via druntime functions -- at best you'd just get some
> obscure file/line number inside druntime code which would be of no help
> locating where in *your* code the allocation happened.)

Something like that might still be of help. At least it wouldn't lie and 
say *no allocations* happened.

But can't we just tag with a UDA a GC allocating function, and then the 
highest-level tag is registered with the profiler? Like:

```d
@gcprofile void bar()
{
    auto x = new int; // not flagged as allocating.
}

@gcprofile void foo()
{
    bar(); // not flagged as allocating.
}

void main()
{
    foo(); // flagged as allocating.
    bar(); // flagged as allocating.
}
```
-Steve