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 globals1;
extern(C) int printf(char*, ...);

char[] gstr = "hello world";

void main()
{
    printf("%.*s\n", gstr.length, gstr.ptr);
    char[] str = gstr;
    printf("%.*s\n", str.length, str.ptr);
}