Support KCallable.call

#KT-2187 Fixed

compiler/testData/codegen/boxWithStdlib/reflection/call/simpleTopLevelFunctions.kt

@@ -0,0 +1,27 @@
+fun String.foo(): Int = length()
+
+var state = "Fail"
+
+fun bar(result: String) {
+    state = result
+}
+
+fun box(): String {
+    val f = (String::foo).call("abc")
+    if (f != 3) return "Fail: $f"
+
+    try {
+        (String::foo).call()
+        return "Fail: IllegalArgumentException should have been thrown"
+    }
+    catch (e: IllegalArgumentException) {}
+
+    try {
+        (String::foo).call(42)
+        return "Fail: IllegalArgumentException should have been thrown"
+    }
+    catch (e: IllegalArgumentException) {}
+
+    (::bar).call("OK")
+    return state
+}