jest.mock() does not work with using backticks e.g. jest.mock(`fs`)

Do you want to request a feature or report a bug? Bug

What is the current behavior?

// Works
jest.mock('fs');

// Doesn't work (backticks instead of single or double quotes)
jest.mock(`fs`);

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

It is not possible to reproduce this on repl.it, but it is pretty simple to test.

1. Create a __mocks__ directory with a mock for fs
2. Create a test which jest.mock(`fs`)s using backticks
3. fs is not mocked

What is the expected behavior?

It should mock fs no matter if single or double quotes or backticks are used.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

Jest: 22.1.4 Node: v8.7.0 npm: 5.6.0

[SimenB]

#5426

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