Minor: remove unused functions

KT-8487

libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/GradleIncrementalCacheImpl.kt

@@ -38,9 +38,6 @@ class GradleIncrementalCacheImpl(targetDataRoot: File, targetOutputDir: File?, t
 
     private val sourceToClassfilesMap = registerMap(SourceToClassfilesMap(SOURCES_TO_CLASSFILES.storageFile))
 
-    fun classfilesBySources(sources: Iterable<File>): Iterable<File> =
-        sources.flatMap { sourceToClassfilesMap[it] }
-
     fun removeClassfilesBySources(sources: Iterable<File>): Unit =
             sources.forEach { sourceToClassfilesMap.remove(it) }
 

libraries/tools/kotlin-gradle-plugin-core/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/Tasks.kt

@@ -104,13 +104,6 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractCo
 
     private fun getKotlinSources(): List<File> = (getSource() as Iterable<File>).filter { it.isKotlinFile() }
 
-    protected fun File.isClassFile(): Boolean {
-        return when (FilenameUtils.getExtension(name).toLowerCase()) {
-            "class" -> true
-            else -> false
-        }
-    }
-
     protected fun File.isKotlinFile(): Boolean {
         return when (FilenameUtils.getExtension(name).toLowerCase()) {
             "kt", "kts" -> true
@@ -160,7 +153,6 @@ open class KotlinCompile() : AbstractKotlinCompile<K2JVMCompilerArguments>() {
             )
 
     fun projectRelativePath(f: File) = f.toRelativeString(project.projectDir)
-    fun projectRelativePath(p: String) = File(p).toRelativeString(project.projectDir)
 
     override fun populateTargetSpecificArgs(args: K2JVMCompilerArguments) {
         // show kotlin compiler where to look for java source files
@@ -694,8 +686,3 @@ internal fun Logger.kotlinInfo(message: String) {
 internal fun Logger.kotlinDebug(message: String) {
     this.debug("[KOTLIN] $message")
 }
-
-internal fun Logger.kotlinLazyDebug(makeMessage: () -> String) {
-    if (this.isInfoEnabled)
-        kotlinDebug(makeMessage())
-}

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -114,14 +114,6 @@ abstract class BaseGradleIT {
         runAndCheck(cmd, check)
     }
 
-
-    fun Project.stopDaemon(check: CompiledProject.() -> Unit) {
-        val cmd = createGradleCommand(arrayListOf("-stop"))
-        println("<=== Stop daemon: $cmd ===>")
-
-        runAndCheck(cmd, check)
-    }
-
     private fun Project.runAndCheck(cmd: List<String>, check: CompiledProject.() -> Unit) {
         val projectDir = File(workingDir, projectName)
         if (!projectDir.exists())
@@ -206,16 +198,12 @@ abstract class BaseGradleIT {
             else
                 assertSameFiles(sources, compiledKotlinSources.projectRelativePaths(this.project), "Compiled Kotlin files differ:\n  ")
 
-    fun CompiledProject.assertCompiledKotlinSources(vararg sources: String, weakTesting: Boolean = false): CompiledProject = assertCompiledKotlinSources(sources.asIterable(), weakTesting)
-
     fun CompiledProject.assertCompiledJavaSources(sources: Iterable<String>, weakTesting: Boolean = false): CompiledProject =
             if (weakTesting)
                 assertContainFiles(sources, compiledJavaSources.projectRelativePaths(this.project), "Compiled Java files differ:\n  ")
             else
                 assertSameFiles(sources, compiledJavaSources.projectRelativePaths(this.project), "Compiled Java files differ:\n  ")
 
-    fun CompiledProject.assertCompiledJavaSources(vararg sources: String, weakTesting: Boolean = false): CompiledProject = assertCompiledJavaSources(sources.asIterable(), weakTesting)
-
     private fun Project.createBuildCommand(params: Array<out String>, options: BuildOptions): List<String> =
             createGradleCommand(createGradleTailParameters(options, params))