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 b;

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

struct S
{
    int i;
    float[4] f;
}

void main()
{
    S s;
    int i = s.i;
    int* p = &s.i;
    *p = 42;
    printf("%d == %d\n", *p, s.i);

    float* f = &s.f[0];
    printf("%f == %f\n", *f, s.f[0]);
    *f = 3.1415;
    printf("%f == %f\n", *f, s.f[0]);
    s.f[0] = 123.456;
    printf("%f == %f\n", *f, s.f[0]);
}