Fix the problems exposed by the callingconv1.d test case. The first was that unless otherwise specified, inputs are assumed to be in registers even if they specify a "matching output" that's in memory. While testing that fix, I also ran into a bug causing the generated "matching output" for any input was always the first one instead of the correct one.

module tangotests.templ1;

import Util = tango.text.Util;

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

void main()
{
    foreach (line; Util.lines("a\nb\nc"))
    {
        printf("%.*s\n", line.length, line.ptr);
    }
}