Function rustc_codegen_llvm::va_arg::round_pointer_up_to_alignment

pub(in va_arg) fn round_pointer_up_to_alignment<'a, 'll, 'tcx>(
    bx: &mut Builder<'a, 'll, 'tcx>, 
    addr: &'ll Value, 
    align: Align, 
    ptr_ty: &'ll Type
) -> &'ll Value