Array append performance 2

[dsimcha]

Nice work on the reference template.  I had thought that the typeid(T).flags()
would be inlined, then constant folded, but CTFE doesn't work on it, so I guess
not.  Probably pretty negligible, but if I have a template laying around to do
this at compile time, I may as well use it.

Also, to answer your question, you do need to call hasNoPointers() each time you
realloc.

import std.stdio, std.gc, std.process;

void main() {
    uint[] foo = (cast(uint[]) malloc(uint.sizeof))[0..1];
    hasNoPointers(foo.ptr);
    foo = cast(uint[]) realloc(foo.ptr, 100_000 * uint.sizeof)[0..100_000];
    //Commenting next line out causes severe mem leaks.
    hasNoPointers(foo.ptr);
    foreach(ref f; foo) {
        f = cast(uint) test();  //Create false pointers.
    }
    system("pause");  //So mem usage can be checked.
}

uint* test() {
    return (new uint[1_000]).ptr;
}

Oh, one more thing:  What's a static struct as opposed to a regular struct?  I've
never seen it used before.  I had assumed that this means a struct composed only
of static members, but apparently not.