Remove unneeded code from Gradle plugin

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/KaptGenerateStubsTask.kt

@@ -96,7 +96,6 @@ open class KaptGenerateStubsTask : KotlinCompile() {
         sourceRoots.log(this.name, logger)
         val args = prepareCompilerArguments()
 
-        compilerCalled = true
         callCompiler(args, sourceRoots, ChangedFiles(inputs))
     }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinGradleBuildServices.kt

@@ -22,8 +22,6 @@ import org.gradle.api.invocation.Gradle
 import org.gradle.api.logging.Logging
 import org.jetbrains.kotlin.compilerRunner.DELETED_SESSION_FILE_PREFIX
 import org.jetbrains.kotlin.compilerRunner.GradleCompilerRunner
-import org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile
-import org.jetbrains.kotlin.gradle.utils.isWindows
 import org.jetbrains.kotlin.gradle.utils.relativeToRoot
 import org.jetbrains.kotlin.utils.addToStdlib.sumByLong
 import java.lang.management.ManagementFactory
@@ -61,7 +59,6 @@ internal class KotlinGradleBuildServices private constructor(gradle: Gradle) : B
     }
 
     private val log = Logging.getLogger(this.javaClass)
-    private val cleanup = CompilerServicesCleanup()
     private var startMemory: Long? = null
     private val shouldReportMemoryUsage = System.getProperty(SHOULD_REPORT_MEMORY_USAGE_PROPERTY) != null
 
@@ -73,18 +70,6 @@ internal class KotlinGradleBuildServices private constructor(gradle: Gradle) : B
 
     override fun buildFinished(result: BuildResult) {
         val gradle = result.gradle!!
-        val kotlinCompilerCalled = gradle.rootProject
-                .allprojects
-                .flatMap { it.tasks }
-                .any { it is AbstractKotlinCompile<*> && it.compilerCalled }
-
-        if (kotlinCompilerCalled) {
-            log.kotlinDebug("Cleanup after kotlin")
-            cleanup(gradle.gradleVersion)
-        }
-        else {
-            log.kotlinDebug("Skipping kotlin cleanup since compiler wasn't called")
-        }
         GradleCompilerRunner.clearBuildModulesInfo()
 
         val rootProject = gradle.rootProject
@@ -132,24 +117,3 @@ internal class KotlinGradleBuildServices private constructor(gradle: Gradle) : B
     private fun getGcCount(): Long =
             ManagementFactory.getGarbageCollectorMXBeans().sumByLong { Math.max(0, it.collectionCount) }
 }
-
-
-internal class CompilerServicesCleanup() {
-    private val log = Logging.getLogger(this.javaClass)
-
-    operator fun invoke(gradleVersion: String) {
-        log.kotlinDebug("compiler services cleanup")
-
-        // clearing jar cache to avoid problems like KT-9440 (unable to clean/rebuild a project due to locked jar file)
-        // problem is known to happen only on windows - the reason (seems) related to http://bugs.java.com/view_bug.do?bug_id=6357433
-        // clean cache only when running on windows
-        if (isWindows) {
-            cleanJarCache()
-        }
-    }
-
-    private fun cleanJarCache() {
-        log.kotlinDebug("Clean JAR cache")
-        log.kotlinDebug("JAR cache cleared")
-    }
-}

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

@@ -180,9 +180,6 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractKo
                 ?: coroutinesFromGradleProperties
                 ?: Coroutines.DEFAULT
 
-    @get:Internal
-    internal var compilerCalled: Boolean = false
-
     // TODO: consider more reliable approach (see usage)
     @get:Internal
     internal var anyClassesCompiled: Boolean = false
@@ -256,8 +253,6 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractKo
 
         sourceRoots.log(this.name, logger)
         val args = prepareCompilerArguments()
-
-        compilerCalled = true
         callCompiler(args, sourceRoots, ChangedFiles(inputs))
     }