[webkit-dev] Watch out for std::optional's move constructor

[Fujii Hironori]

I don't like the proposal because it encourages misuse of move.
We can use move only for values about to be destroyed.

I like Dan's suggestion. We should use std::exchange or std::optional::swap
for the cases.
Or, what about adding a new method WTF::Optional::release() for the case?
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