Fix type inferencing and code select for DSLD and other method overloads

[eric-milles]

Consider the following:

class A {
  def foo(int i = 0) {
  }
}
class B {
  @Delegate A a = new A()
  def foo() {
  }
}

Declared method B#foo() is not replaced by delegate method A#foo(), but editor displays that it is.

[eric-milles]