Fixed ModuleInfo generation to no longer use the ModuleInfo class' default initializer for types/defaults, it's unsafe as initializers don't necesarily match the "formal" type. There might be explicit padding. Changed -g switch to emit DW_LANG_D debug info, make demangling work with a patched GDB, still more work to do for full support of D's Dwarf extensions. Added getNullValue helper method.

module bug3;

struct S
{
    int[] arr;
    char[5] ch;
}

class C
{
    int[] arr;
    char[4] crs;
}

void main()
{
    S s;
    s.arr = new int[5];
    s.arr[1] = 32;
    int i;
    i = s.arr[0];
    //assert(s.arr[0] == 0);
    //assert(s.arr[1] == 32);
}