Bump wasm dependency to v1.1 (#1032)

* Bump wasm dependency to v1.1

this prepares for #1000

This rips out multi-value support in our serializer/parser.

* Special stack_type encoding/decoding

* Bumping wasm changed the FloatLit printing

I hope that is ok.

* Update nix/ocaml-wasm.nix

Co-Authored-By: Gabor Greif <ggreif@gmail.com>

Building.md

@@ -36,17 +36,7 @@ installing all required tools without nix is out of scope).
    [`opam`](https://opam.ocaml.org/doc/Install.html)
  * Install the packages:
    ```
-   opam install num vlq yojson menhir stdio js_of_ocaml js_of_ocaml-ppx ppx_inline_test bisect_ppx atdgen
-   ```
- * Install the `wasm` Ocaml package. We use a newer version than is on opam, and a
-   fork that supports the multi-value extension. See `nix/ocaml-wasm.nix` for
-   the precise repository and version. You can use `nix` to fetch the correct
-   source for you, and run the manual installation inside:
-   ```
-   cp -R $(nix-build --no-out-link -Q -A wasm.src)/interpreter /tmp/interpreter
-   cd /tmp/interpreter
-   chmod u+w -R .
-   make install
+   opam install num vlq yojson menhir stdio js_of_ocaml js_of_ocaml-ppx ppx_inline_test bisect_ppx atdgen wasm
    ```
  * Install various command line tools used by, in particuar, the test suite:
    ```

nix/ocaml-wasm.nix

@@ -8,13 +8,13 @@ else
 
 stdenv.mkDerivation rec {
   name = "ocaml${ocaml.version}-wasm-${version}";
-  version = "1.0";
+  version = "1.1";
 
   src = fetchFromGitHub {
     owner = "WebAssembly";
-    repo = "multi-value";
-    rev = "fa755dfe0c8ab3ec93636a092fc3dfbe8c8a232c";
-    sha256 = "0867nd4k2lypal7g2a7816wi5zs4kp4w2dv9dxan9vvn3wi19b5i";
+    repo = "spec";
+    rev = "v${version}";
+    sha256 = "1jsgrjqzsdmm6f5pgd947nikj7pnxx1mqdnz16j7s62rg8x06h7d";
   };
 
   buildInputs = [ ocaml findlib ocamlbuild ];