Always meet error `TypeError: Cannot redefine property: wrap` in CI

[yjhmelody]

I writen some jest unit tests, but the first case is fine but the later cases are all failed because Cannot redefine property: wrap:

FAIL src/tests/env.spec.ts
  ● Test suite failed to run

    TypeError: Cannot redefine property: wrap
        at Function.defineProperty (<anonymous>)

      at Object.call (../../node_modules/assemblyscript/dist/webpack:/assemblyscript/std/portable/index.js:384:8)
      at i (../../node_modules/assemblyscript/dist/webpack:/assemblyscript/webpack/bootstrap:19:32)
      at Object.call (../../node_modules/assemblyscript/dist/webpack:/assemblyscript/src/glue/js/index.ts:6:1)
      at __webpack_require__ (../../node_modules/assemblyscript/dist/webpack:/assemblyscript/webpack/bootstrap:19:32)
      at ../../node_modules/assemblyscript/dist/webpack:/assemblyscript/webpack/startup:3:1
      at factory (../../node_modules/assemblyscript/dist/assemblyscript.js:7:758416)
      at ../../node_modules/assemblyscript/dist/webpack:/assemblyscript/webpack/universalModuleDefinition:3:20
      at Object.<anonymous> (../../node_modules/assemblyscript/dist/webpack:/assemblyscript/webpack/universalModuleDefinition:1:1)

I don't know why my local code have not met such errors. But I cannot avoid this error in github CI.
Maybe we should add if before Object.defineProperty for portable/index.js:

Object.defineProperty(Int16Array, "wrap", {
  value: function wrap(buffer, byteOffset, length) {
    return new Int16Array(buffer, byteOffset, length);
  }
});

[willemneal]

This actually is a warning that multiple versions of the compiler have been loaded. This can lead to issues if they are different versions. This is precisely why the visitor-as provides it's own reexported assemblyscript, see visitor-as/as, that searches through node's cache to find a complier that is already loaded. I think the better solution than what your PR does is to move this logic into the loading of assemblyscript itself.

[github-actions]

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