Same idea as r310419: The 8 byte nop is a suffix of the 9 byte nop, and we need at most 6 bytes.
This isn't strictly necessary for anything; I was just debugging something and noticed that a hook fell back to Trampoline rather than Hotpatch because the prefix nop was only 8 bytes.
I see that we've done this before in rL310419. This was originally added in rL275180. It'd be nice to figure out what tools generate this nop so we can enumerate all the patterns, but for now let's just do this.