Fixed auto-import of operator functions broken before + fixed bug in its implementation

idea/testData/quickfix/autoImports/falsePostfixOperator.before.Main.kt

@@ -0,0 +1,16 @@
+// "Import" "false"
+// ACTION: Create function 'inc'
+// ACTION: Create local variable '++'
+// ACTION: Create parameter '++'
+// ACTION: Inspection 'UNUSED_CHANGED_VALUE' options
+// ACTION: Replace overloaded operator with function call
+// ERROR: Unresolved reference: ++
+
+package h
+
+trait H
+
+fun f(h: H?) {
+    var h1 = h
+    h1<caret>++
+}

idea/testData/quickfix/autoImports/falsePostfixOperator.before.data.Sample.kt

@@ -0,0 +1,4 @@
+package util
+
+fun h.H.inc(p: Int): h.H {
+}