fix(10019): for-loop labels cannot be renamed

[a-tarasyuk]

Fixes #10019

[DanielRosenwasser]

@typescript-bot pack this

[typescript-bot]

Heya @DanielRosenwasser, I've started to run the tarball bundle task on this PR at edd08a8. You can monitor the build here.

[typescript-bot]

Hey @DanielRosenwasser, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/82539/artifacts?artifactName=tgz&fileId=4FC44C77A2D472C278DB182E669E48F8306D3F47A4C06E279BBF10AF3251450702&fileName=/typescript-4.1.0-insiders.20200818.tgz"
    }
}

and then running npm install.

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There is also a playground for this build.