Make == for associative arrays test for equality, not identity. _aaEq was added to runtime/internal/aaA.d which forwards to TypeInfo_AssociativeArray.equals in genobj.d. On the codegen side, DtoAAEquals was added to gen/aa.cpp and is called from EqualExp::toElem in gen/toir.cpp. I assume that the frontend will produce an error if == is used on associative arrays of different type. This fixes DMD bug 1429.

module typeinfo8;
extern(C) int printf(char*, ...);
struct S
{
    void func()
    {
    }
}

void main()
{
    S a;
    auto ti = typeid(typeof(&a.func));
    auto s = ti.toString;
    printf("%.*s\n", s.length, s.ptr);
    assert(s == "void delegate()");
}