Mark only unreachable parts of element if it has reachable parts

like for 'return todo()' mark only 'return'

compiler/testData/diagnostics/tests/controlFlowAnalysis/deadCode/deadCodeInCalls.kt

@@ -0,0 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun testArgumentInCall() {
+    fun bar(i: Int, s: String, x: Any) {}
+
+    <!UNREACHABLE_CODE!>bar(<!>1, todo(), <!UNREACHABLE_CODE!>"")<!>
+}
+
+fun testArgumentInVariableAsFunctionCall(f: (Any) -> Unit) {
+    f<!UNREACHABLE_CODE!>(<!>todo()<!UNREACHABLE_CODE!>)<!>
+}
+
+fun todo() = throw Exception()