Cranelift meeting 2021-09-20: add agenda item to continue to discuss ISLE
1. Announcements
1. _Sumbit a PR to add your announcement here_
1. Other agenda items
- 1. _Sumbit a PR to add your item here_
+ 1. Further discussion of ISLE, the proposed instruction selector DSL, as outlined in [RFC #15](https://github.com/bytecodealliance/rfcs/pull/15)
## Notes
