Update Wasm_of_ocaml CI

Author: vouillon

.github/workflows/wasm_of_ocaml.yml

@@ -46,6 +46,12 @@ jobs:
             # Jane Street tests disabled for now (basement only works on Linux)
             jane_street_tests: false
             all_jane_street_tests: false
+          - os: ubuntu-latest
+            os-name: Ubuntu
+            ocaml-compiler: "ocaml-variants.5.3.1+trunk"
+            separate_compilation: true
+            jane_street_tests: true
+            all_jane_street_tests: true
           - os: ubuntu-latest
             os-name: Ubuntu
             ocaml-compiler: "5.3"
@@ -99,6 +105,10 @@ jobs:
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
+      - name: patch compiler
+        if: matrix.ocaml-compiler == 'ocaml-variants.5.3.1+trunk'
+        run: opam pin ocaml-variants https://github.com/hhugo/ocaml.git#optimization-hints
+
       - name: Set-up Binaryen
         uses: Aandreba/[email protected]
         with: