Create non-variadic functions without existingType using reflection

[Ankit Gupta]

Hey Folks, 

If I have argument type for a function: is it possible to create a function with those? 

Note: 

- we don't have reflect type for the function to be created so makeFunc can not be simply used.

- function inputTypes can differ so variadic can not be leveraged here.

- number of inputs can differ.

eg:

input arg types: TypeA, TypeB

expected output: func(TypeA, TypeB)

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Also, if it makes thing easier: Base problem which I have is:

input: func(inputTypes) (outputTypes)

expectedOutput: func(inputTypes)

Thanks!

[Ian Lance Taylor]

Use https://pkg.go.dev/reflect#FuncOf to get the type to pass to MakeFunc.

Ian