BTW, do you have cross-module inlining on? I wonder if that makes a difference if you didn't have it on before. (I'm somewhat speaking from ignorance, as I've heard people talk about this limitation, but am not sure exactly when it's enabled)
I don't know much about this either. Clang has link-time optimization with -O4, but looking at the --help of LDC it turns out -O4 is equivalent to -O3 for D. Maybe someone else knows?
