Fix some assembler issues: The assembler was miscompiling "add" (specifically, the "add reg/mem, imm" variations). The change that caused this seems to have been made because without it, some "add"s didn't compile at all. This patch reverts the previous change, and makes sure assembler operands are remapped correctly even though the input operands auto-generated due to updating operations aren't explicitly used.

interface MyInterface
{
    int func();
}

class MyClass : MyInterface
{
    int var;
    int func()
    {
        return var;
    }
}

void func1(MyInterface i)
{
    int delegate() dg = &i.func;
    func2(dg);
}

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

void func2(int delegate() dg)
{
    int i = dg();
    printf("%d\n", i);
}

void main()
{
    auto c = new MyClass;
    c.var = 42;
    func1(c);
}