Support await expression in yield expression

[dsherret]

Input code

async function* main() {
  yield await 0;
}

Expected behavior

Parses.

Actual behaviour

Line 2, column 9: Expected ';', '}' or <eof>

Version

master

I looked into this a bit, but I wasn't sure why it was parsing an assignment expression for a yield expression's expression (I'm not too familiar with this).

[swc-bot]

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