sfc compiles invalid code for nested await

[QiroNT]

Version

3.2.6

Reproduction link

https://sfc.vuejs.org/#eyJBcHAudnVlIjoiPHNjcmlwdCBzZXR1cD5cbmF3YWl0IChhd2FpdCAxKVxuPC9zY3JpcHQ+XG4ifQ==

Steps to reproduce

1. write a nested await
2. compile

What is expected?

The code runs as normal.

What is actually happening?

The code is invalid.

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