This was supportted before https://reviews.llvm.org/rL301769.
In rL301769, It removed this support for no uses for this feature.
But getBitsSet which calls setBits still comment If hiBit is less than loBit then the set bits "wrap". . This is a little confusing.
I add this feature back because in PowerPC, I need it to combine two PPC::RLWINM which will be posted later. In PPC::RLWINM wrapping set bits is supportted.