Fixed a critical bug in the runtime, where _d_allocmemoryT would mark the memory block as having pointers (for scanning) opposite of what it should. So pointers would not be seen and freed. Should fix a bunch of regressions with AAs.

module strings2;

import std.string;
import std.stdio;

void main()
{
    int i = 32;
    auto str = format(i);
    writefln(str);

    long l = 123123;
    str = format(l);
    writefln(str);
}