src,test: allow creating Function with move-only functor #1065
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Function::New fails to compile when given a move-only functor. For
example, when constructing a callback function for Promise#then, a
lambda might capture an ObjectReference. Creating a Function for such a
lambda results in a compilation error.
Tweak Function::New to work with move-only functors.
For existing users of Function::New, this commit should not change
behavior.