Drop UNREACHABLE_CODE eager text range calculation

#KT-35242 Fixed

idea/testData/codeInsight/changeLocality/Comment.kt

@@ -0,0 +1,17 @@
+// SCOPE: '// some change'
+
+class Comment {
+    fun q() {
+
+    }
+
+    val someValue: String
+        get() {
+            return "X"
+        }
+
+    fun baa() {
+        <selection>// some change</selection>
+        val list = listOf<String>(TODO(""))
+    }
+}