new should lower to a template function call

[Steven Schveighoffer]

On 7/24/20 10:06 AM, Andrei Alexandrescu wrote:
> We need to template all we can of druntime. All those silly C-style 
> functions decaying to void* and dependencies and runtime type 
> information must go.

Yes please! Template implementations make bugs in the runtime so much 
easier to fix, and make features easier to add. Not to mention all the 
inference we lose when we don't do it this way.

Consider all the features added to AAs via templates. Even though they 
have to be thin wrappers around the C-style functions, it allows much 
better control over which calls are valid.

-Steve