Import alias of inner class and method overloads can cause type inferencing breakdown

Follow up to #908.  Consider the following:
```groovy
import java.util.Map.Entry as KeyValPair
class C {
  void meth(x = 'x', y = 'y', KeyValPair pair) {
    ...
  }
}
```
Syntax coloring, type inferencing, code select, etc. within the method body are missing.