Move lazy var to separate file

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyDeclarationBase.kt

@@ -65,34 +65,4 @@ abstract class IrLazyDeclarationBase(
             else -> throw AssertionError("Package or class expected: $containingDeclaration; for $currentDescriptor")
         }
     }
-}
-
-
-internal fun <T> lazyVar(initializer: () -> T): UnsafeLazyVar<T> = UnsafeLazyVar(initializer)
-
-
-internal class UnsafeLazyVar<T>(initializer: () -> T) {
-    private var isInitialized = false;
-    private var initializer: (() -> T)? = initializer
-    private var _value: Any? = null
-
-    private val value: T
-        get() {
-            if (!isInitialized) {
-                _value = initializer!!()
-                isInitialized = true
-                initializer = null
-            }
-            @Suppress("UNCHECKED_CAST")
-            return _value as T
-        }
-
-    override fun toString(): String = if (isInitialized) value.toString() else "Lazy value not initialized yet."
-
-    operator fun getValue(thisRef: Any?, property: KProperty<*>): T = value
-
-    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
-        this._value = value
-        isInitialized = true
-    }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/lazyUtil.kt

@@ -0,0 +1,31 @@
+package org.jetbrains.kotlin.ir.declarations.lazy
+
+import kotlin.reflect.KProperty
+
+internal fun <T> lazyVar(initializer: () -> T): UnsafeLazyVar<T> = UnsafeLazyVar(initializer)
+
+internal class UnsafeLazyVar<T>(initializer: () -> T) {
+    private var isInitialized = false;
+    private var initializer: (() -> T)? = initializer
+    private var _value: Any? = null
+
+    private val value: T
+        get() {
+            if (!isInitialized) {
+                _value = initializer!!()
+                isInitialized = true
+                initializer = null
+            }
+            @Suppress("UNCHECKED_CAST")
+            return _value as T
+        }
+
+    override fun toString(): String = if (isInitialized) value.toString() else "Lazy value not initialized yet."
+
+    operator fun getValue(thisRef: Any?, property: KProperty<*>): T = value
+
+    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
+        this._value = value
+        isInitialized = true
+    }
+}