Smart completion: support for overloaded method calls

idea/testData/completion/smart/OverloadedMethodCallArgument1.kt

@@ -0,0 +1,18 @@
+val s = ""
+val i = 123
+
+fun f(p1: Any, p2: String, p3: Int) {
+    foo(<caret>123) // this call is resolved to Foo(Int) but types from all signatures should participate
+}
+
+fun foo(p1: String, p2: Any) {
+}
+
+fun foo(p1: Int) {
+}
+
+// ABSENT: p1
+// EXIST: p2
+// EXIST: p3
+// EXIST: s
+// EXIST: i