REPL overload resolution ambiguity

Fix overload resolution ambiguity in REPL. Note, resolution for
functions declared in script is very different from regular programs:
in scripts function declared later wins. See
functionOverloadResolutionAnyBeatsString for example.

#KT-2272 Fixed

compiler/tests/org/jetbrains/jet/repl/ReplInterpreterTest.java

@@ -92,6 +92,16 @@ public class ReplInterpreterTest {
         testFile("twoClosures.repl");
     }
 
+    @Test
+    public void functionOverloadResolutionAnyBeatsString() {
+        testFile("functionOverloadResolutionAnyBeatsString.repl");
+    }
+
+    @Test
+    public void functionOverloadResolution() {
+        testFile("functionOverloadResolution.repl");
+    }
+
     @Test
     public void empty() {
         testFile("empty.repl");