Remove unreachable code

(cherry picked from commit c2331802f928cb2f48e8b6745726527ef4462908)

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/IncrementalContextBase.kt

diff --git a/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/IncrementalContextBase.kt b/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/IncrementalContextBase.kt
index 182ffa5..ad57cf8 100644
--- a/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/IncrementalContextBase.kt
+++ b/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/IncrementalContextBase.kt
@@ -640,17 +640,4 @@
         initialSet.forEach { visit(it) }
         return visitedFiles
     }
-
-    private val noSourceFilePrefix = "<NoSourceFile for "
-    private val noSourceFileSuffix = " is a virtual file; DO NOT USE.>"
-
-    /**
-     * Returns `true` if the file represents is a class literal reference in an annotation argument.
-     */
-    private fun isClassLiteralReferenceInAnnotationArgument(file: File): Boolean {
-        return file != anyChangesWildcard &&
-            file != removedOutputsKey &&
-            file.path.startsWith(noSourceFilePrefix) &&
-            file.path.endsWith(noSourceFileSuffix)
-    }
 }