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 a;

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

int i = 42;

void main()
{
    int j;
    j = i;
    int* p;
    p = &j;
    int k = *p;
    assert(k == 42);

    byte b = -1;
    int i = b;
    assert(i == -1);

    int* p2 = p;

    printf("Done\n");
}