Remove an old workaround that was kept around for ABI-compatibility on x86-64 between different LLVM versions. This means LLVM r67588 is required if you want to compile for x86-64, otherwise the backend will assert when you try to return e.g. struct { int i; char c; } from a function. (In particular, this is no longer compatible with LLVM 2.5) It also means that any code returning small structs on x86-64 will probably need to be recompiled in order to be linkable to code compiled with this change.

module bug10;
extern(C) int printf(char*, ...);

class C
{
    char[] msg;

    this()
    {
    }
    this(char[] msg)
    {
        this.msg = msg;
    }
}

void main()
{
    auto c = new C();
    c.msg = "world";
    auto b = new C("hello");
    printf("%.*s\n", b.msg.length, b.msg.ptr);
    printf("%.*s\n", c.msg.length, c.msg.ptr);
}