FIR: Fix processOverriddenFunctions implementations

compiler/fir/analysis-tests/testData/resolve/properties/javaAccessorsComplex.kt

@@ -0,0 +1,38 @@
+// FILE: JA.java
+public interface JA<E> {
+    public E getFoo();
+}
+
+// FILE: main.kt
+
+interface KB<F> {
+    override fun getFoo(): F
+    override fun getBar(): F
+}
+
+interface D1 : JA<String>, KB<String>
+interface E1 : D1 {
+    override fun getFoo(): String
+    override fun getBar(): String
+}
+
+interface D2 : KB<String>, JA<String>
+interface E2 : D2 {
+    override fun getFoo(): String
+    override fun getBar(): String
+}
+
+fun main(
+    d1: D1, e1: E1,
+    d2: D2, e2: E2,
+) {
+    d1.foo
+    d1.<!UNRESOLVED_REFERENCE!>bar<!>
+    e1.foo
+    e1.<!UNRESOLVED_REFERENCE!>bar<!>
+
+    d2.foo
+    d2.<!UNRESOLVED_REFERENCE!>bar<!>
+    e2.foo
+    e2.<!UNRESOLVED_REFERENCE!>bar<!>
+}

compiler/fir/analysis-tests/testData/resolve/properties/javaAccessorsComplex.txt

@@ -0,0 +1,33 @@
+FILE: main.kt
+    public abstract interface KB<F> : R|kotlin/Any| {
+        public abstract override fun getFoo(): R|F|
+
+        public abstract override fun getBar(): R|F|
+
+    }
+    public abstract interface D1 : R|JA<kotlin/String>|, R|KB<kotlin/String>| {
+    }
+    public abstract interface E1 : R|D1| {
+        public abstract override fun getFoo(): R|kotlin/String|
+
+        public abstract override fun getBar(): R|kotlin/String|
+
+    }
+    public abstract interface D2 : R|KB<kotlin/String>|, R|JA<kotlin/String>| {
+    }
+    public abstract interface E2 : R|D2| {
+        public abstract override fun getFoo(): R|kotlin/String|
+
+        public abstract override fun getBar(): R|kotlin/String|
+
+    }
+    public final fun main(d1: R|D1|, e1: R|E1|, d2: R|D2|, e2: R|E2|): R|kotlin/Unit| {
+        R|<local>/d1|.R|/D1.foo|
+        R|<local>/d1|.<Unresolved name: bar>#
+        R|<local>/e1|.R|/E1.foo|
+        R|<local>/e1|.<Unresolved name: bar>#
+        R|<local>/d2|.R|/D2.foo|
+        R|<local>/d2|.<Unresolved name: bar>#
+        R|<local>/e2|.R|/E2.foo|
+        R|<local>/e2|.<Unresolved name: bar>#
+    }