Allow GC to do the cleanup

js/embed/soljson_interface.js

@@ -13,6 +13,9 @@ mergeInto(LibraryManager.library, {
   resolc_compile: function (inputPtr, inputLen) {
     const inputJson = UTF8ToString(inputPtr, inputLen);
     var revive = createRevive();
+    // Allow GC to clean up the data
+    revive.wasmBinary = undefined
+    revive.soljson = undefined
     revive.writeToStdin(inputJson);
 
     // Call main on the new instance