Compilation Exception - remove duplicated this on stack

#KT-3114 Fixed

compiler/testData/codegen/box/classes/kt3114.kt

@@ -0,0 +1,13 @@
+class KeySpan(val left: String) {
+
+    public fun matches(value : String) : Boolean {
+
+        return left > value && left > value
+    }
+
+}
+
+fun box() : String {
+  KeySpan("1").matches("3")
+  return "OK"
+}