Our test infrastructure can't deal with async `import()`

[mstange]

In #1203 I'm trying to add a module that uses WebAssembly. WASM modules need to be instantiated asynchronously, so Webpack requires them to be in a code-split async chunk. So you need to use the import() function to load such modules.

However, our tests don't like the import() call: they now fail with the message "Not supported":

  ● doSymbolicateProfile › doSymbolicateProfile › updates the symbolication status

    Not supported

       8 | import bisection from 'bisection';
       9 |
    > 10 | const demanglerModule = import('gecko-profiler-demangle');
      11 |
      12 | import type { RequestedLib } from '../types/actions';
      13 | import type { SymbolTableAsTuple } from './symbol-store-db';

      at Object.<anonymous> (src/profile-logic/symbol-store.js:10:25)
      at Object.<anonymous> (src/actions/receive-profile.js:11:1)
      at Object.<anonymous> (src/test/fixtures/stores.js:7:1)
      at Object.<anonymous> (src/test/store/symbolication.test.js:5:1)

[julienw]

Maybe we need to set up https://babeljs.io/docs/en/babel-plugin-syntax-dynamic-import/ for the tests in https://github.com/devtools-html/perf.html/blob/87eb4c73b3e75eea24c82e8f7950142402bd905b/.babelrc#L29-L32

[mstange]

#1203 has taken care of this.