Build fix for the latest LLVMContext changes (LLVM r75445) This shouldn't break the build with older LLVM revs. We include LLVMContext.h in gen/llvm.h now to make the transition a little bit easier.

struct Foo;

Foo* foo()
{
    return null;
}

void main()
{
    Foo* f = foo();
    assert(f is null);
}