KT-3503 Can't navigate to implementation of kotlin functions

#KT-3503 Fixed

idea/testData/navigation/implementations/FunctionOverrideNavigation.kt

@@ -0,0 +1,21 @@
+package testing
+
+open class Base {
+    open fun <caret>test() {
+    }
+}
+
+open class SubBase: Base() {
+    override fun test() {
+
+    }
+}
+
+class SubSubBase: SubBase() {
+    override fun test() {
+    }
+}
+
+
+// REF: (in testing.SubBase).test()
+// REF: (in testing.SubSubBase).test()

idea/testData/navigation/implementations/multifile/ImplementFunInJava/ImplementFunInJava.java

@@ -0,0 +1,7 @@
+package testing.jj;
+
+public class JavaBase extends testing.kt.KotlinBase {
+    @Override
+    public void test() {
+    }
+}

idea/testData/navigation/implementations/multifile/ImplementFunInJava/ImplementFunInJava.kt

@@ -0,0 +1,7 @@
+package testing.kt
+
+open class KotlinBase {
+  open fun <caret>test() {}
+}
+
+// REF: (in testing.jj.JavaBase).test()

idea/testData/navigation/implementations/multifile/ImplementMethodInKotlin/ImplementMethodInKotlin.java

@@ -0,0 +1,5 @@
+public class BaseJava {
+    public void testMethod() {
+
+    }
+}

idea/testData/navigation/implementations/multifile/ImplementMethodInKotlin/ImplementMethodInKotlin.kt

@@ -0,0 +1,13 @@
+package testing.kt
+
+class TestFromJava() : BaseJava() {
+    override fun testMethod() {
+    }
+}
+
+fun test() {
+    BaseJava().testMethod<caret>()
+}
+
+// REF: (in testing.kt.TestFromJava).testMethod()
+// REF: (in BaseJava).testMethod()