transpiler: handle named parameters

[vsavkin]

 it('should compile named params when the last argument is a map', function() {
    function f(a, {b, c}) {return a + b + c;}

    expect(f(1, {b: 2, c: 3})).toBe(6);
  });

  it('should compile to a map when keys are quoted', function() {
    function f(m) {return m["a"] + m["b"];}

    expect(f({"a": 1, "b": 2})).toBe(3);
  });

[mhevery]

This should also handle default values for the named parameters

function({a=1}) => a({a:1})

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