Cranelift: add agenda item for further discussion of ISLE in upcoming Oct 4 meeting.
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 DSL](https://github.com/bytecodealliance/rfcs/pull/15)
## Notes
