Add release notes (#12132)

Author: alexcrichton

RELEASES.md

@@ -4,8 +4,91 @@ Unreleased.
 
 ### Added
 
+* WASIp3 support for `wasi:http` now implements `Response::from_http` to convert
+  from standard Rust types to WASI types.
+  [#12063](https://github.com/bytecodealliance/wasmtime/pull/12063)
+
+* Cranelift now supports a "patchable" ABI which has a maximum number of
+  arguments and clobbers no registers. This is paired as well with a new
+  `patchable_call` instruction which supports being turned into NOPs at runtime.
+  [#12061](https://github.com/bytecodealliance/wasmtime/pull/12061)
+  [#12101](https://github.com/bytecodealliance/wasmtime/pull/12101)
+
 ### Changed
 
+* Support for the WebAssembly `threads` proposal is now classified as tier 2 by
+  default. Additionally creation of `SharedMemory` is disabled by deafult behind
+  a new config knob/CLI flag.
+  [#12036](https://github.com/bytecodealliance/wasmtime/pull/12036)
+
+* A variety of peephole-style optimizations have been added to Cranelift's
+  optimization passes.
+  [#11994](https://github.com/bytecodealliance/wasmtime/pull/11994)
+  [#11995](https://github.com/bytecodealliance/wasmtime/pull/11995)
+  [#11996](https://github.com/bytecodealliance/wasmtime/pull/11996)
+  [#11997](https://github.com/bytecodealliance/wasmtime/pull/11997)
+  [#11998](https://github.com/bytecodealliance/wasmtime/pull/11998)
+  [#11999](https://github.com/bytecodealliance/wasmtime/pull/11999)
+  [#12000](https://github.com/bytecodealliance/wasmtime/pull/12000)
+  [#12006](https://github.com/bytecodealliance/wasmtime/pull/12006)
+  [#12008](https://github.com/bytecodealliance/wasmtime/pull/12008)
+
+* Component host functions have been slightly optimized to remove an `Arc` clone
+  and reduce contention.
+  [#11987](https://github.com/bytecodealliance/wasmtime/pull/11987)
+
+* Support for component-model-async has been updated to account for the binary
+  changes specified in [WebAssembly/component-model#578](https://github.com/WebAssembly/component-model/pull/578).
+  [#12031](https://github.com/bytecodealliance/wasmtime/pull/12031)
+
+* The `UnsyncBoxBody` type is now used everywhere in wasmtime-wasi-http instead
+  of just in the wasip3 support.
+  [#12060](https://github.com/bytecodealliance/wasmtime/pull/12060)
+
+* Initial groundwork for gracefully handling OOM (e.g. returning an error
+  instead of aborting) has been added.
+  [#12070](https://github.com/bytecodealliance/wasmtime/pull/12070)
+  [#12089](https://github.com/bytecodealliance/wasmtime/pull/12089)
+
+* Wasmtime will create a private copy of code memory when guest debugging is
+  enabled to assist with modifying code when adding/removing breakpoints.
+  [#12051](https://github.com/bytecodealliance/wasmtime/pull/12051)
+
+* The `ResourceTable` type will no longer use `Tombstone` when compiled in debug
+  mode.
+  [#12114](https://github.com/bytecodealliance/wasmtime/pull/12114)
+
+* Intra-component future/stream reads/writes will now trap instead of
+  accidentally being allowed.
+  [#12117](https://github.com/bytecodealliance/wasmtime/pull/12117)
+
+* Cranelift optimization rules have been tweaked after it was discovered that
+  they could pessimize code containing long chains of computations.
+  [#12116](https://github.com/bytecodealliance/wasmtime/pull/12116)
+
+### Fixed
+
+* Compilation of `i8x16.popcnt` has been fixed in Winch for some potential
+  inputs.
+  [#12010](https://github.com/bytecodealliance/wasmtime/pull/12010)
+
+* A panic in `Instance::prepare_call` for some component-model-async situations
+  has been fixed.
+  [#12054](https://github.com/bytecodealliance/wasmtime/pull/12054)
+
+* An off-by-one error for lifting/lowering enums/variants with 255 cases has
+  been fixed.
+  [#12066](https://github.com/bytecodealliance/wasmtime/pull/12066)
+
+* Restarting the read of a host future after cancellation has been fixed.
+  [#12093](https://github.com/bytecodealliance/wasmtime/pull/12093)
+
+* Compilation for OpenBSD on x86\_64 has been fixed.
+  [#12097](https://github.com/bytecodealliance/wasmtime/pull/12097)
+
+* Components containing a module type which exoprts a `tag` are now supported.
+  [#12125](https://github.com/bytecodealliance/wasmtime/pull/12125)
+
 --------------------------------------------------------------------------------
 
 Release notes for previous releases of Wasmtime can be found on the respective