Chuanqi Xu 4f4340ee2a [NFC] [Coroutines] Refactor implementation in checkFinalSuspendNoThrow ...

Now when we are checking if the expression `co_await
promise.final_suspend()` is not throw, we would check unconditionally
for its child expressions recursively. It takes unnecessary time. And
the compiler would complains if the implementation in final_suspend()
may throw even if the higher level function signature marked noexcept
already.

This fixes bug48453 too.

2022-01-14 15:37:01 +08:00

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