[mlir][func] Use the generated pass options in func to llvm.

[mlir][func] Use the generated pass options in func to llvm.

Update the FuncToLLVM pass to use the generated constructors and
the generated pass option struct. The hand written constructor
got out of sync after some refactorings. Using a generated constructor
and options struct ensures the everything remains in sync.

Reviewed By: zero9178

Differential Revision: https://reviews.llvm.org/D143733