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 tangotests.marray2;

void main()
{
    int[][] ma = new int[][](2,4);
    assert(ma.length == 2);
    assert(ma[0].length == 4);
    assert(ma[1].length == 4);
    ma[0][3] = 32;
    ma[1][2] = 123;
    ma[0][0] = 55;
    assert(ma[0][3] == 32);
    assert(ma[1][2] == 123);
    assert(ma[0][0] == 55);
}