Field spanning multiple sub-words is no longer checked

[j-klier]

I'm trying to understand why checking rule 10.6.1.f was removed? 7b6c549

        # 10.6.1-f: Any field that is software-writable or clear on read shall
        # not span multiple software accessible sub-words (e.g., a 64-bit
        # register with a 32-bit access width may not have a writable field with
        # bits in both the upper and lower half of the register).

As far as I can tell, it is still a requirement. Was it moved somewhere else in the code?