Remove 'AsyncArrowFunction' test

[linusg]

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Fixes #4044

[nicolo-ribaudo]

There is an implementation-contributed one at https://github.com/tc39/test262/blob/6c60904d42b4872a3aa1224fc7ad2c4c733e9685/implementation-contributed/v8/mjsunit/es8/async-await-basic.js#L82-L93

[ptomato]

This ties into something else I've been trying to figure out; do implementations actually execute those implementation-contributed tests?

[anba]

[...] do implementations actually execute those implementation-contributed tests?

No, because the tests contain implementation internal functions and syntax.

[ptomato]

@linusg We deleted the implementation-contributed folder because it couldn't be run by other implementations anyway, so could you add the test that Ms2ger requested? Otherwise this seems ready to merge.

[linusg]

Thanks for the ping, I'll try to do that ASAP.

[linusg]

Done, PTAL!