std.uni.ReallocPolicy question

[Eduard Staniloiu]

Anybody knows why `std/uni.ReallocPolicy`'s `realloc` and 
`destroy` are `@trusted`?
Those were introduced by this PR: 
https://github.com/dlang/phobos/pull/6041/files

`realloc` and `destroy` are never `@safe` solely from their point 
of view, as they don't know if there are any references to the 
memory they are freeing. The caller has this information and he 
can safely make the call to them `@trusted`.

Cheers,
Edi