Code cleanup: type parameters can have in / out variance

compiler/util/src/org/jetbrains/kotlin/utils/CachedValueProperty.kt

@@ -18,7 +18,7 @@ package org.jetbrains.kotlin.utils
 
 import kotlin.reflect.KProperty
 
-class CachedValueProperty<TValue : Any, TTimestamp : Any>(
+class CachedValueProperty<out TValue : Any, TTimestamp : Any>(
         private val calculator: () -> TValue,
         private val timestampCalculator: () -> TTimestamp
 ) {

compiler/util/src/org/jetbrains/kotlin/utils/concurrent.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.utils.concurrent.block
 
-class LockedClearableLazyValue<T: Any>(val lock: Any, val init: () -> T) {
+class LockedClearableLazyValue<out T: Any>(val lock: Any, val init: () -> T) {
     @Volatile private var value: T? = null
 
     fun get(): T {