Make object literal properties new identifier locations when not contextually typed

[andrewbranch]

Fixes #42595

[andrewbranch]

@typescript-bot pack this

[typescript-bot]

Heya @andrewbranch, I've started to run the tarball bundle task on this PR at 581ad93. You can monitor the build here.

[typescript-bot]

Hey @andrewbranch, 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/94734/artifacts?artifactName=tgz&fileId=9BC4F63633CFF0695B4863FD92134399535943BD860CDE9B66D1BF268DBF601702&fileName=/typescript-4.2.0-insiders.20210202.tgz"
    }
}

and then running npm install.

---

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@4.2.0-pr-42612-2".;

[DanielRosenwasser]

Add a test for comma tokens.