Copy release notes from 0.32.1 patch branch into main RELEASES.md.
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+## 0.32.1
+
+Released 2022-01-04.
+
+### Fixed
+
+* Cranelift: remove recently-added build dependency on `sha2` to allow usage in
+ some dependency-sensitive environments, by computing ISLE manifest hashes
+ with a different hash function.
+ [#3619](https://github.com/bytecodealliance/wasmtime/pull/3619)
+
+* Cranelift: fixed 8- and 16-bit behavior of popcount (bit population count)
+ instruction. Does not affect Wasm frontend.
+ [#3617](https://github.com/bytecodealliance/wasmtime/pull/3617)
+
+* Cranelift: fixed miscompilation of 8- and 16-bit bit-rotate instructions.
+ Does not affect Wasm frontend.
+ [#3610](https://github.com/bytecodealliance/wasmtime/pull/3610)
+
## 0.32.0
Released 2021-12-13.
