generate pseudocode for functions in local classes

#KT-4405 In progress
 #KT-3501 Fixed

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt3501.kt

@@ -0,0 +1,9 @@
+//KT-3501 Variable/parameter is highlighted as unused if it is used in member of local class
+
+fun f(p: String) { // "p" is marked as unused
+    class LocalClass {
+        fun f() {
+            <!UNUSED_EXPRESSION!>p<!>
+        }
+    }
+}

compiler/testData/diagnostics/tests/controlFlowAnalysis/localClasses.kt

@@ -0,0 +1,26 @@
+package f
+
+fun f() {
+    class LocalClass() {
+        {
+            val <!UNUSED_VARIABLE!>x1<!> = "" // ok: unused
+
+            fun loc1(): Int {
+                val <!UNUSED_VARIABLE!>x1_<!> = "" // ok: unused
+            <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+        }
+
+        fun f() {
+            val <!UNUSED_VARIABLE!>x2<!> = "" // error: should be UNUSED_VARIABLE
+
+            fun loc2(): Int {
+                val <!UNUSED_VARIABLE!>x2_<!> = "" // error: should be UNUSED_VARIABLE
+            <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY, NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+        }
+
+        val v: String
+            get() {
+                val <!UNUSED_VARIABLE!>x3<!> = "" // ok: unused
+            <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+    }
+}