Add today's Cranelift meeting notes (#3522)

* Add today's Cranelift meeting notes

* Update cranelift-11-15.md

meetings/cranelift/2021/cranelift-11-15.md

@@ -13,8 +13,67 @@
 1. Other agenda items
     1. _Sumbit a PR to add your item here_
     
-## Notes
-
 ### Attendees
 
+* Alexa VanHattum
+* abrown
+* akirilov
+* alexcrichton
+* bbouvier
+* bjorn3
+* cfallin
+* fitzgen
+* jlbirch
+* uweigand
+
 ### Notes
+
+* cfallin: merged ISLE RFC, ended FCP this morning. Need to review compiler &
+  integration, shouldn't take too long hopefully. How to prioritize moving over
+  afterwards? I think we should enable moving everything over reasonably
+  quickly. Will unlock improvements to backend design such as RA2. How do others
+  feel about helping migration?
+* uweigand: Agreed ASAP. Busy working on .NET recently, but release is over!
+  Look to do more Wasmtime work soon.
+* jlbirch: Also agreed ASAP, and should have time to help.
+* cfallin: I'll spend time writing docs for the DSL itself.
+* fitzgen: Wrote an overview awhile back and need to write more, yes.
+* akirilov: should have more time next quarter
+* uweigand: can migrate one-by-one, right?
+* cfallin: indeed!
+* abrown: how much of x64 is left to do?
+* fitzgen: unsure on lines of code, but integer arithmetic is all ported. Alex
+  has more SSE stuff as well. Maybe halfway?
+* cfallin: ballpark estimate nick?
+* fitzgen: few weeks?
+* uweigand: only simple things?
+* fitzgen: complicated things too like i128 and SSE things. For example `shl`
+  for i128 is quite large. Currently porting on-by-one as I go through the big
+  `match`.
+
+#### Status
+
+* cfallin: internal project mostly, got info from Mozilla it's ok to relicense
+  regalloc2 and then "all" we need to do is to review the compatibility shim to
+  regalloc.rs API. Alternatively if timing goes the other way if we transition
+  to ISLE happens we can port directly to the pure SSA API, but ISLE does
+  everything that would otherwise be done by hand. Still some benefits with a
+  compat shim to compile time but more benefits with SSA API. Will write docs on
+  ISLE soon.
+* fitzgen: Lots of ISLE. Also work on `wasm-mutate` is progressing. Also ran
+  benchmarks for ISLE and good results.
+
+... discussion of `wasm-mutate`, wasmtime fuzzing, veriwasm, ...
+
+* acrichto: random ISLE x64 lowerings
+* bbouvier: no updates
+* akirilov: mostly internal thing. Things about CFI as well. Will need to change
+  proposal a bit for a rustc backend.
+
+... discussion about CFI ...
+
+* uweigand: no updates, next step is to implement atomics. Will wait for ISLE
+  before adding SIMD.
+* abrown: no updates
+* bjorn3: no updates
+* jlbirch: simd fuzz bug fix