Update cranelift-03-21.md (#3952)

meetings/cranelift/2022/cranelift-03-21.md

@@ -9,12 +9,32 @@
     1. Please help take notes.
     1. Thanks!
 1. Announcements
-    1. _Submit a PR to add your announcement here_
 1. Other agenda items
-    1. _Submit a PR to add your item here_
 
-## Notes
 
 ### Attendees
 
+Andrew Brown
+George Kulakowski
+Sam Parker-Haynes
+Alexa VanHattum
+Johnnie Birch
+bjorn3
+
 ### Notes
+
+AB: merged several PRs related to x64 ISLE lowering; one of them exposed a regalloc bug during fuzzing, looking into it.
+
+GK: getting familiar with the Wasm ecosystem (e.g., Cranelift); read Chris' status about the move to regalloc2 (#3942) which, in summary, is progressing but needs some more refactoring before review.
+
+SP: coming back from vacation, starting to look at aarch64 backend again; continuing work on flexible vectors, working through issues with fully dynamic types in the IR in a way that does not require too many changes to the RFC proposal.
+
+AV: working on IR for verification, hoping to handle multiple rule chains soon.
+
+JB: needs to get a patch ready for review; planning to continue ISLE lowering.
+
+bjorn3: no comments
+
+SP: with the regalloc2 changes, will we need to make changes to the backends?
+
+GK: probably not...