Fix invalid usage of getOverriddenDescriptors in JetLineMarkerProvider

idea/testData/codeInsight/lineMarker/DelegatedFun.kt

@@ -0,0 +1,13 @@
+trait <lineMarker></lineMarker>A {
+    fun <lineMarker></lineMarker>f() {
+    }
+}
+
+trait <lineMarker></lineMarker>B : A
+
+open class <lineMarker></lineMarker>C(b : B) : B by b, A {
+}
+
+class D(b : B) : C(b) {
+  override fun <lineMarker descr="<b>internal</b> <b>open</b> <b>fun</b> f(): jet.Unit <i>defined in</i> D<br/>overrides<br/><b>internal</b> <b>open</b> <b>fun</b> f(): jet.Unit <i>defined in</i> A"></lineMarker>f() {}
+}

idea/testData/codeInsight/lineMarker/DelegatedProperty.kt

@@ -0,0 +1,13 @@
+trait <lineMarker></lineMarker>A {
+    val <lineMarker></lineMarker>f: Int
+        get() = 3
+}
+
+trait <lineMarker></lineMarker>B : A
+
+open class <lineMarker></lineMarker>C(b : B) : B by b, A {
+}
+
+class D(b : B) : C(b) {
+    override val <lineMarker descr="<b>internal</b> <b>open</b> <b>val</b> f: jet.Int <i>defined in</i> D<br/>overrides<br/><b>internal</b> <b>open</b> <b>val</b> f: jet.Int <i>defined in</i> A"></lineMarker>f: Int = 2
+}

idea/testData/codeInsight/lineMarker/FakeOverrideFun.kt

@@ -0,0 +1,11 @@
+trait <lineMarker></lineMarker>A {
+  fun <lineMarker></lineMarker>f() {}
+}
+
+trait <lineMarker></lineMarker>B : A
+
+trait <lineMarker></lineMarker>C : B, A
+
+class SomeClass() : C {
+  override fun <lineMarker descr="<b>internal</b> <b>open</b> <b>fun</b> f(): jet.Unit <i>defined in</i> SomeClass<br/>overrides<br/><b>internal</b> <b>open</b> <b>fun</b> f(): jet.Unit <i>defined in</i> A"></lineMarker>f() {}
+}

idea/testData/codeInsight/lineMarker/FakeOverrideFunWithMostRelevantImplementation.kt

@@ -0,0 +1,13 @@
+trait <lineMarker></lineMarker>A {
+    fun <lineMarker></lineMarker><lineMarker></lineMarker>f() {}
+}
+
+trait <lineMarker></lineMarker>B : A {
+    override fun <lineMarker></lineMarker>f() {}
+}
+
+trait <lineMarker></lineMarker>C : B, A
+
+class SomeClass() : C {
+    override fun <lineMarker descr="<b>internal</b> <b>open</b> <b>fun</b> f(): jet.Unit <i>defined in</i> SomeClass<br/>overrides<br/><b>internal</b> <b>open</b> <b>fun</b> f(): jet.Unit <i>defined in</i> B"></lineMarker>f() {}
+}

idea/testData/codeInsight/lineMarker/FakeOverrideProperty.kt

@@ -0,0 +1,12 @@
+trait <lineMarker></lineMarker>A {
+    val <lineMarker></lineMarker>f: Int
+        get() = 2
+}
+
+trait <lineMarker></lineMarker>B : A
+
+trait <lineMarker></lineMarker>C : B, A
+
+class SomeClass() : C {
+    override val <lineMarker descr="<b>internal</b> <b>open</b> <b>val</b> f: jet.Int <i>defined in</i> SomeClass<br/>overrides<br/><b>internal</b> <b>open</b> <b>val</b> f: jet.Int <i>defined in</i> A"></lineMarker>f: Int = 4
+}