- xtheadmempair: Make overlapping register encoding reserved
- xtheadmempair: Clarify atomicity for load/store-pair instructions
- xtheadbb: clarify rotate-right instructions
- xtheadmempair: fix mem index typos in lwd and swd
- xtheadmemidx: fix memidx load/store l{ur}s/{ur} description errors in RV64/RV32
- Add T-Head VECTOR vendor extension.